If you have PMOS (PCOS) and you're trying to conceive, the statistics can feel validating and terrifying in equal measure. A large Australian survey found that around half of women with PMOS (PCOS) reported fertility problems, against about one in five of those without it [1]. That number is real, and if you're sitting with it right now, you're not imagining how hard this feels.

Here is what that number doesn't tell you. In a Swedish registry study of 45,395 women with PMOS (PCOS), 80.2% went on to have a child, compared with 78.2% of women without it, though it took longer and often needed help [2]. The draft NICE guideline says the same thing in plain words: it is often possible to conceive with or without medical assistance [3]. This is not a closed door.

I know that from the most personal place possible. I was diagnosed with PCOS at 19 and told I might never have children. Years later, after six miscarriages and more research than I ever expected to do, I understood my body in a way the medical system had never helped me to. I became a mother, twice. This is what I wish someone had told me.

PCOS has been renamed PMOS (polyendocrine metabolic ovarian syndrome), and the NHS now uses the new name, so we use both here while the change beds in [4].

This guide covers what PMOS (PCOS) does to fertility, when to see your GP, six habits with real research behind them, and what medical treatment can offer. It's not a magic fix. Your diagnosis is a starting point, not a verdict, and nothing here replaces care from your GP or a fertility specialist.

In this guide:

• Does PMOS (PCOS) affect fertility?
• When should you start preparing, and when should you see your GP?
• What should you eat when trying to conceive?
• Which supplements have evidence?
• Do alcohol and caffeine matter?
• How much does exercise and weight matter?
• Do sleep and stress affect fertility?
• Does tracking your cycle help?
• What can your doctor offer?
• Frequently asked questions

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Does PMOS (PCOS) Affect Fertility?

It can, and the main reason is ovulation. A review of anovulatory infertility found that about 80% of women with anovulatory infertility have PMOS (PCOS) [5]. Read that carefully: it's the share of anovulation caused by PMOS, not the share of women with PMOS who can't conceive.

What do the large cohorts show? The Swedish study followed women for up to 26 years. Women with PMOS (PCOS) were less likely to have a first child at any given time (fecundity ratio 0.81), and much less likely to have one after a spontaneous pregnancy (0.58), but cumulative childbirth ended up similar at 80.2% against 78.2% [2]. In the Australian survey, 51% of women with PMOS (PCOS) reported infertility, against 21% without [1]. Neither study proves cause.

Why does it happen? Higher androgens and a disrupted LH pattern make regular ovulation less likely. Insulin resistance adds a layer: surrogate markers suggest it affects about 44% to 70% of women with PMOS (PCOS), and by the gold-standard clamp method some women have normal insulin sensitivity [6]. So not everyone has it, and not everyone with it has the same pattern.

That matters because the fixes differ. If you're not ovulating, that's the problem to solve. If you are, something else may be going on, and your GP can look into it.

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When Should You Start Preparing, and When Should You See Your GP?

Preparation first. The NHS advises taking folic acid ideally three months before you start trying [7]. That three months is about folic acid, not about egg maturation. The old claim that eggs take 90 days to mature doesn't hold up: follicle development from the earliest stage to ovulation takes close to a year, with the final stretch measured in months [8]. So habits are worth starting early, but there's no 90-day deadline.

The evidence that general preconception preparation improves birth rates is thin, and I couldn't find a trial showing it does. What the guidelines say is that weight, blood pressure, smoking, alcohol, diet, sleep and exercise are worth optimising, and that folate supplementation is recommended [9, 3]. Treat the habits below as sensible, not guaranteed.

Now the timing for medical help. The standard advice is to see your GP if you haven't conceived after a year of regular unprotected sex, and sooner if you're 36 or over or already know about a fertility problem [10, 11]. NICE's fertility guideline says to refer at presentation if either partner has a known or suspected cause, and irregular or absent periods are named as an example [11].

So if you have a PMOS (PCOS) diagnosis, or periods that come every few months, book the appointment when you start trying, not after twelve months of waiting. Ask about ovulation testing, semen analysis for your partner and a plan.

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What Should You Eat When Trying to Conceive With PMOS (PCOS)?

Habit 1: Eat for stability, not perfection. There's no fertility diet with proof behind it, and anyone selling you one is overpromising. The 2023 international guideline found no evidence that any one diet composition beats another in PMOS (PCOS), and the draft NICE guideline says the same [9, 3].

What about the Mediterranean diet? A scoping review of 36 observational studies found it had the strongest and most consistent link with clinical pregnancy rates, while concluding there was insufficient evidence to recommend any specific diet for fertility [12]. A 2023 meta-analysis of 11 studies found the pooled result in assisted reproduction cohorts wasn't statistically significant until studies at serious risk of bias were removed [13]. In an IVF cohort of 244 non-obese women in Athens, those in the top third for Mediterranean diet adherence had a live birth rate of 48.8% versus 26.6% in the bottom third, but only in women under 35 [14]. None of this was PMOS-specific.

So the honest summary: Mediterranean-style eating is a sensible, nutritious pattern with encouraging observational data. It isn't proven to improve fertility in PMOS (PCOS). In practice:

• Vegetables, pulses, whole fruit and wholegrains at most meals.
• Olive oil, nuts and seeds as your main fats.
• Protein at every meal, from fish, eggs, dairy, pulses and poultry.
• Fewer ultra-processed snacks, and regular meals so you're not riding blood sugar swings.

Omega-3 and oily fish. In the Time to Conceive cohort, women who took omega-3 supplements had a fecundability ratio of 1.51 after full adjustment, but the result wasn't significant in women already taking a multivitamin, and confounding by general health habits is likely [15]. In PMOS (PCOS) specifically, a meta-analysis of 9 trials (591 women) found omega-3 lowered insulin resistance (HOMA-IR) and cholesterol, with no fertility outcomes and several trials at unclear risk of bias [16].

The NHS says girls and women trying for a baby should have no more than two portions of oily fish a week (a portion is about 140 g), and should avoid fish liver oil supplements, which contain vitamin A [17]. Two portions is a cap, not a target.

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Which Supplements Have Evidence for Fertility With PMOS (PCOS)?

Habit 2: Take the basics, and be sceptical about the rest. Supplements are the area where marketing runs furthest ahead of the research, so here's the table with the caveats left in.

A note on inositol. A 3,602-woman figure often circulates, but it comes from a German questionnaire study with no comparison group, so I've left it out. The best summary is the 2024 meta-analysis of 30 trials, which called the evidence limited and inconclusive [24].

UK rules on claims are narrow. Zinc contributes to normal fertility and reproduction, and folate contributes to maternal tissue growth during pregnancy. No authorised claim says a supplement helps you conceive.

Read this first. Preconception is a food supplement. It's not a treatment for PMOS (PCOS) or infertility, and it doesn't replace folic acid advice from your GP, a varied diet or fertility care. It contains folate, so tell your GP or pharmacist about it if you've been prescribed 5 mg folic acid, so you don't double up, and check the label if you take other supplements. As the table shows, evidence for inositol and the antioxidant ingredients is limited. See also our guide on which MyOva supplements to take for fertility.

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Do Alcohol and Caffeine Affect Fertility?

Habit 3: Decide your alcohol position deliberately. The NHS says that if you're planning to become pregnant you should not drink alcohol, and the UK Chief Medical Officers say the safest approach is not to drink at all, while noting that small amounts drunk before you knew you were pregnant are likely low risk [27, 28]. That's the guidance. The old '1 to 2 units once or twice a week' wording still sits in NICE's fertility guideline, but it sits next to the same 'safest to avoid' line [11].

What does the research say about conception itself? It's mixed. A Danish cohort of 6,120 women trying to conceive found that drinking fewer than 14 drinks a week was no different from abstaining for fecundability, while 14 or more was linked to lower fecundity, though only 1.2% of women drank that much so the estimate is imprecise [29]. A meta-analysis of 19 observational studies found lower fecundability even with light drinking, but heterogeneity was high [30]. A Danish registry cohort found a higher infertility risk at 7 or more drinks a week in women over 30 [31], while a 2018 review judged the evidence of harm from moderate drinking weaker than once thought [18].

You don't need to panic about a glass of wine before you knew you were trying. The simplest rule is the UK one: planning a pregnancy, avoid alcohol.

Caffeine. NICE says there's no consistent evidence linking caffeinated drinks to fertility problems [11]. The 200 mg a day limit is an NHS pregnancy limit, so keep it in mind once you're pregnant, but it isn't a trying-to-conceive rule.

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How Much Do Exercise and Weight Matter for Fertility With PMOS (PCOS)?

Habit 4: Move regularly, in a way you can keep up. The 2023 guideline recommends 150 to 300 minutes of moderate activity a week for adults with muscle-strengthening on two days, and says there's a lack of evidence that any one type or intensity is better [9]. The draft NICE guideline agrees [3].

In the trials, exercise has helped metabolic markers. A meta-analysis of 18 trials found exercise alone lowered fasting insulin and HOMA-IR, though the authors graded the evidence at the lowest certainty [32]. Another of 20 trials found that vigorous exercise gave the largest fall in HOMA-IR (36.2%), that resistance training was 'likely' to help HOMA-IR, and that results for androgens were inconclusive [33]. None of this directly measures pregnancy, so treat exercise as support for metabolic health, not a fertility treatment.

You may have read that hard training raises cortisol and blocks ovulation in PMOS (PCOS). I couldn't find evidence for that, so it's not here. The real risk at the other end is different: women with a low BMI or who exercise at extreme levels can stop ovulating because of energy deficit, and NICE says moderating exercise may improve ovulation in that group [11].

Weight. It's a sensitive topic and a complicated one. NICE says a BMI of 30 or over is likely to take longer to conceive, and that if you're not ovulating, losing weight is likely to increase your chance of conception [11]. But a Dutch trial of 574 women with a BMI of 29 or over found that a six-month weight-loss programme before treatment gave a lower rate of a healthy singleton birth than starting treatment straight away (27.1% against 35.2%) [34]. So don't delay care to lose weight first. The draft NICE guideline says not to deny ovulation induction on BMI alone below 40 [3]. Our guide to PMOS (PCOS) weight loss goes deeper.

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Do Sleep and Stress Affect Fertility With PMOS (PCOS)?

Habit 5: Protect your sleep and your nervous system, without turning it into another job.

On sleep, a US preconception cohort of 6,873 women found no significant link between sleep duration and fecundability. But women who reported trouble sleeping more than half the time had a fecundability ratio of 0.87, a modest reduction [35]. A wider review calls the link plausible but data-poor [36]. For PMOS (PCOS), sleep apnoea is a separate known issue, so loud snoring or daytime sleepiness is worth raising with your GP [3]. Our guide to PMOS (PCOS) and sleep has practical steps.

On stress, the NHS says stress can affect your relationship and sex drive, and that in severe cases it may affect ovulation and sperm production [10]. But a meta-analysis of 14 studies and 3,583 women found that emotional distress before a single IVF cycle wasn't associated with pregnancy outcomes [37]. So the honest picture is that stress takes a toll on you, and the evidence that it is why you haven't conceived is weak.

Please don't let anyone tell you that you can't get pregnant because you're anxious. Trying and waiting is stressful, and that's a normal reaction. Support, rest and community are worth having because they help you, not because they're a fertility tactic. For more, see our guide to stress and PMOS (PCOS).

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Does Tracking Your Cycle Help When Trying to Conceive With PMOS (PCOS)?

Habit 6: Track to learn, not to obsess. You can't conceive without ovulating, and with PMOS (PCOS) ovulation is often the missing piece. Tracking helps you spot a pattern, and gives your GP something concrete to work from.

Useful things to record are the first day of each period, how long cycles last, cervical mucus changes, and the results of any ovulation tests. A word of caution: apps that predict ovulation from past cycle length assume regular cycles, and luteinising hormone (LH) strips can give confusing results when your LH runs high. Our guide to apps and devices for tracking ovulation covers the options.

If you're not seeing signs of ovulation, say so. A blood test for progesterone, timed about a week before an expected period, is a standard way for a GP to check whether you ovulated. Our guide to anovulation explains what it means when you don't.

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What Can Your Doctor Offer for Fertility With PMOS (PCOS)?

Habits help, but medical treatment is often what makes the difference, and there's no shame in it. The 2023 guideline says letrozole should be the first-line pharmacological treatment for ovulation induction in infertile anovulatory women [9]. The draft NICE guideline follows with a similar order [3]:

• Letrozole first for anovulatory infertility. It's used off-label for this purpose in the UK, so ask your specialist about this.
• Clomifene, with or without metformin, if letrozole isn't suitable or tolerated, for no more than six cycles.
• Gonadotrophins if the first-line options don't work.
• Laparoscopic ovarian diathermy may be considered.
• IVF if the criteria in NICE's fertility guideline are met [11].

The draft guideline is clear on the other side of the ledger too. It says not to deny ovulation induction based on BMI alone if your BMI is below 40, that inositol isn't effective for fertility problems, and that anti-obesity medicines shouldn't be used for fertility treatment outside research [3]. NICE expects to publish the final guideline in December 2026, so details may change.

For IVF, see our guide to preparing for IVF with PMOS (PCOS).

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Frequently Asked Questions

Can you get pregnant naturally with PMOS (PCOS)?

Often, yes. In a Swedish registry study, 80.2% of women with PMOS (PCOS) had a child, close to the 78.2% in women without it, though it took longer [2]. The draft NICE guideline says it is often possible to conceive with or without medical assistance [3].

What is the best supplement for fertility with PMOS (PCOS)?

Folic acid is the one with clear UK advice: 400 micrograms a day from when you start trying until 12 weeks of pregnancy. The NHS also advises vitamin D in autumn and winter. Inositol is not recommended for fertility problems by the draft NICE guideline [7, 20, 3].

How long does it take to improve fertility with PMOS (PCOS)?

There's no fixed timeline. The NHS says to take folic acid ideally three months before trying. If you haven't conceived after a year, or you have irregular periods or are 36 or over, see your GP sooner [7, 10].

Does stress stop you getting pregnant with PMOS (PCOS)?

The NHS says severe stress may affect ovulation, but a meta-analysis of 3,583 women found distress before IVF wasn't linked to pregnancy outcomes. Stress is a poor explanation for infertility, so don't blame yourself [10, 37].

Should I lose weight before trying to conceive with PMOS (PCOS)?

NICE says weight loss may improve your chance of conception if you're not ovulating. A Dutch trial found delaying treatment for a six-month weight-loss programme gave a lower rate of healthy births. Talk to your GP about the right order [11, 34].

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The Bottom Line

PMOS (PCOS) can make conception slower, and the numbers around it are real. But most women with PMOS (PCOS) do go on to have children, and the best-supported steps are less glamorous than the internet makes out: folic acid, vitamin D in the right months, an alcohol decision, regular movement, sleep, cycle tracking, and an early conversation with your GP. No supplement, including ours, is a shortcut.

Your body is trying to tell you something, and it isn't 'try harder'. Hormonal literacy isn't complicated, it's just rarely taught. Start with the folic acid, book the appointment, and ask for help sooner rather than later.

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Related Reading

• Which MyOva Supplements Should I Be Taking for Improved Fertility With PMOS (PCOS)?
• 6 of the Best Apps and Devices for Tracking Your Cycle and Ovulation With PMOS (PCOS)
• Anovulation: What It Is, Why It Happens and What Helps
• PCOS and Egg Quality: What the Research Actually Shows
• Preparing for IVF With PMOS (PCOS): What the Research Says
• PMOS (PCOS) and Sleep: How to Get a Good Night's Rest

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This article is for educational purposes only and does not constitute medical advice. Guidance details are accurate to the sources cited at the time of writing and may change when NICE publishes its final PMOS guideline. MyOva products are food supplements, not medicines, and are not intended to diagnose, treat, cure or prevent any disease. Food supplements should not replace a varied diet. If you are trying to conceive, speak to your GP or a fertility specialist.

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References