You Are Not Alone — and Pregnancy Is Possible
If you’ve been diagnosed with PMOS (previously known as PCOS) and you’re trying to conceive, this article is for you.
PMOS — polyendocrine metabolic ovarian syndrome — is the leading hormonal cause of ovulatory infertility. It affects one in eight women. And while that statistic can feel isolating when you’re in the middle of a conception journey that isn’t going to plan, there is a great deal of reason for hope.
The majority of women with PMOS who receive appropriate care and treatment do go on to have successful pregnancies. Understanding your condition, working with the right specialist, and being informed about your options can make an enormous difference.
This is your complete fertility guide for PMOS.
Why Does PMOS Affect Fertility?
To understand PMOS and fertility, it helps to understand the hormonal processes involved.
In a typical cycle, the brain sends hormonal signals (via FSH and LH) to the ovaries, stimulating a follicle to develop, mature, and release an egg — ovulation. For women with PMOS, this process is disrupted at multiple levels:
- Elevated androgens (testosterone and related hormones) interfere with normal follicle development
- Insulin resistance leads to excess insulin, which stimulates the ovaries to produce even more androgens — creating a compounding cycle
- Elevated LH levels drive excess androgen production in the ovaries
- Multiple small follicles begin developing but fail to reach maturity or release an egg
The result can be cycles where ovulation doesn’t occur (anovulation), occurs infrequently, or occurs unpredictably — all of which make conception more challenging.
The good news is that each of these disruptions is addressable with the right interventions.
Step One: Know Whether You Are Ovulating
Many women with PMOS assume that because they have periods, they are ovulating. This isn’t always the case. It’s possible to have a bleed without ovulating — known as an anovulatory cycle.
Ways to assess whether you are ovulating include:
- Ovulation predictor kits (OPKs) — these detect the LH surge that precedes ovulation, though they can give false positives in women with PMOS due to chronically elevated LH levels
- Basal body temperature (BBT) charting — tracking your morning temperature can help identify the temperature shift that occurs after ovulation
- Progesterone blood test — a blood test around day 21 of your cycle (or 7 days after expected ovulation) can confirm whether ovulation has occurred
- Ultrasound monitoring — a fertility specialist can use serial ultrasounds to track follicle development and confirm ovulation
Knowing whether and when you are ovulating is the foundation of any fertility plan for women with PMOS.
Lifestyle and PMOS Fertility: The Evidence
For many women with PMOS, lifestyle changes are the first and most impactful intervention for fertility. This is not about weight loss for its own sake — it is about addressing the underlying metabolic drivers of the condition.
Nutrition
A diet that supports insulin sensitivity is beneficial for most women with PMOS. This generally means:
- Emphasising whole foods, fibre, vegetables, lean proteins, and healthy fats
- Moderating refined carbohydrates and added sugars, which drive insulin spikes
- Regular, balanced meals to maintain stable blood sugar levels
There is no single ‘PMOS diet,’ but evidence supports low-glycaemic and Mediterranean-style eating patterns for improving hormonal and metabolic markers.
Movement and Exercise
Regular physical activity — both cardiovascular exercise and strength training — improves insulin sensitivity, reduces androgen levels, and can restore ovulation in some women with PMOS. Even modest increases in physical activity have been shown to have meaningful effects.
Weight and Fertility
It is important to approach this topic with sensitivity. While evidence does show that excess weight can exacerbate PMOS symptoms — including disrupting ovulation — PMOS also makes weight management genuinely more difficult due to insulin resistance. Women with PMOS are not failing at weight management; their condition makes it harder.
A modest improvement in metabolic health (which does not always require significant weight loss) can meaningfully improve ovulation and fertility outcomes.
Stress and Sleep
Chronic stress and poor sleep quality worsen insulin resistance and hormonal imbalance. Managing stress and prioritising sleep quality are underrated but genuinely important aspects of fertility support for women with PMOS.
Medical Treatments for PMOS-Related Infertility
When lifestyle optimisation alone is not sufficient to restore ovulation and achieve pregnancy, there are several well-established medical treatments.
Metformin
Metformin is an insulin-sensitising medication primarily used for type 2 diabetes, but with significant evidence in PMOS. By improving insulin sensitivity, it can reduce androgen levels, help restore ovulation, and improve menstrual regularity.
Metformin is often used in combination with other fertility treatments and may improve outcomes when used alongside ovulation induction.
Ovulation Induction: Letrozole and Clomiphene
Ovulation induction medications stimulate the ovaries to develop and release an egg. These are typically first-line fertility treatments for women with PMOS.
- Letrozole (an aromatase inhibitor) is currently considered the preferred first-line agent for ovulation induction in PMOS, with evidence showing higher live birth rates than clomiphene in this population
- Clomiphene citrate has a long history of use and remains effective for many women with PMOS
Ovulation induction is typically monitored with ultrasound to assess follicle development and reduce the small risk of multiple pregnancy.
Intrauterine Insemination (IUI)
IUI involves preparing a sperm sample and placing it directly into the uterus at the time of ovulation (whether natural or induced). It is a minimally invasive procedure that can improve conception rates when combined with ovulation induction.
IUI is often considered when ovulation induction alone has not resulted in pregnancy after several cycles, or when there are mild male factor considerations.
In Vitro Fertilisation (IVF)
IVF involves stimulating the ovaries to produce multiple eggs, retrieving them, fertilising them in a laboratory, and transferring the resulting embryo(s) to the uterus.
For women with PMOS, IVF requires careful management due to the risk of ovarian hyperstimulation syndrome (OHSS) — a condition where the ovaries respond too strongly to stimulation. Experienced fertility specialists use tailored stimulation protocols and, where appropriate, freeze-all strategies (where embryos are frozen and transferred in a later, unstimulated cycle) to manage this risk effectively.
IVF success rates for women with PMOS are generally favourable, particularly in women who have a good ovarian reserve — which most women with PMOS do.
Other Interventions
- Inositol supplementation (particularly myo-inositol and D-chiro-inositol) has growing evidence for improving insulin sensitivity and ovulation in PMOS, though it should be discussed with your doctor before use
- Anti-obesity medications may be considered in certain circumstances to support metabolic improvement
- Bariatric surgery has been shown to restore spontaneous ovulation in women with PMOS and significant obesity, in selected cases
Pregnancy With PMOS: What to Expect
For women with PMOS who do conceive, it is important to be aware that the condition can be associated with certain pregnancy-related risks. These include:
- Gestational diabetes — women with PMOS have a higher risk and should be monitored
- Pre-eclampsia — elevated blood pressure in pregnancy requires monitoring
- Preterm birth — slightly elevated risk, though absolute risk remains low for most women
- Miscarriage — some research suggests a modestly elevated miscarriage risk, though this is not inevitable and many women with PMOS have uncomplicated pregnancies
Knowing these risks means you can be appropriately monitored during pregnancy. Being cared for by a team that understands PMOS — including an obstetrician aware of the metabolic and endocrine dimensions — is beneficial.
Most women with PMOS who receive appropriate prenatal care go on to have healthy pregnancies and healthy babies.
Emotional Wellbeing on Your Fertility Journey
The emotional toll of fertility challenges should never be minimised. Trying to conceive when you have PMOS can be exhausting, confusing, and at times deeply distressing. Many women feel a sense of grief or loss when conception takes longer than hoped, and the hormonal features of PMOS can themselves contribute to anxiety and depression.
A few gentle reminders:
- Your feelings are valid — whatever you are experiencing emotionally on this journey
- Seeking psychological support (whether through a therapist, a support group, or a counsellor with fertility experience) is a sign of strength, not weakness
- You do not have to navigate this alone — connecting with other women with PMOS can be profoundly supportive
- Give yourself grace with your timeline — fertility journeys rarely go exactly as planned, and that is not a reflection of your worth or your body’s capability
Working With a Fertility Specialist: What to Ask
When you consult a fertility specialist about PMOS, these are questions worth asking:
- Are you experienced in managing PMOS-related infertility?
- Should we investigate whether I am ovulating, and how?
- Should I consider metformin as part of my treatment plan?
- What ovulation induction protocol do you recommend, and why?
- How will my metabolic health be monitored and supported?
- What is the plan if ovulation induction is unsuccessful?
- If we proceed to IVF, how will the risk of OHSS be managed?
A good fertility specialist will welcome these questions and tailor their approach to your individual profile — not just your fertility diagnosis, but your full hormonal and metabolic picture.
Frequently Asked Questions: PMOS and Fertility
Can I get pregnant naturally with PMOS?
Yes — many women with PMOS conceive naturally, particularly when ovulation is occurring, even irregularly. Lifestyle optimisation can improve ovulation frequency for some women.
How long should I try naturally before seeking help?
General guidance is to seek evaluation after 12 months of trying (or 6 months if you are 35 or older). However, if you know you have PMOS and are not ovulating regularly, it is reasonable to seek specialist input sooner.
Does PMOS get worse over time?
The hormonal features of PMOS tend to change with age. Some aspects — like irregular ovulation — may improve somewhat as women approach their mid-30s, while metabolic risks may increase without appropriate management.
Can PMOS cause miscarriage?
There is some evidence of a modestly elevated miscarriage risk in women with PMOS, but many women with PMOS have entirely uncomplicated pregnancies. If you have experienced recurrent miscarriage, this should be investigated thoroughly.
Is IVF always necessary for women with PMOS?
No. Many women with PMOS conceive with simpler interventions such as lifestyle changes, metformin, or ovulation induction medications. IVF is typically considered after other approaches have been tried.
Does PMOS affect egg quality?
PMOS can affect the process of follicle development and ovulation, but women with PMOS often have a good ovarian reserve and, with appropriate stimulation, can produce good-quality eggs for fertility treatment.
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Disclaimer: This content is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before making decisions about fertility treatment.
About the Author
Leigh-Ann Geydien is the founder of Fertility Solutions, South Africa’s only dedicated fertility directory. With a deep commitment to patient advocacy, she built the platform to bridge the gap between those navigating fertility challenges and the clinics and reproductive health specialists best placed to help them.
Published by Fertility Solutions South Africa | Based on: Teede HJ et al. The Lancet, May 12, 2026.
