Polycystic ovary syndrome (PCOS) affects 1 in 10 women of reproductive age and is the single most common cause of ovulatory infertility. Yet the diagnosis is often delivered without much follow-up guidance, leaving many women worried and unsure what it means for their future.
The honest answer is: most women with PCOS can and do get pregnant — with or without medical help. Here's what you need to understand.
Why PCOS Affects Fertility
PCOS disrupts the normal hormonal cycle that triggers ovulation. In a typical cycle, rising LH levels trigger the release of a mature egg. In PCOS, LH levels are often chronically elevated, preventing the mid-cycle LH surge that triggers ovulation from occurring reliably. Eggs begin maturing but don't reach full maturity and aren't released — instead they remain as small, immature follicles (the "cysts" visible on ultrasound, though they're not true cysts).
The result is: irregular or absent ovulation, unpredictable cycles, and therefore unpredictable (or no) fertile windows. This is why PCOS makes conception harder — not impossible, but harder to time.
PCOS exists on a spectrum. Some women with PCOS ovulate irregularly (every 35–60 days rather than every 28), while others may rarely or never ovulate without intervention. Tracking your cycle carefully — particularly with OPKs and BBT — tells you which category you're in.
Lifestyle Changes That Improve PCOS Fertility
For women with PCOS who are overweight, even a 5–10% reduction in body weight can restore ovulation in many cases. This is because fat tissue produces oestrogen, which can worsen the hormonal imbalance underlying PCOS. But the lifestyle changes below benefit all women with PCOS, regardless of weight:
- Low-glycaemic diet — reducing blood sugar spikes by choosing whole grains, legumes, vegetables, and protein over refined carbohydrates directly addresses insulin resistance, which underlies PCOS for most women
- Regular exercise — particularly resistance training and HIIT, which improve insulin sensitivity
- Inositol supplementation — myo-inositol (2,000–4,000mg daily) has strong evidence for improving ovulation rates, egg quality, and menstrual regularity in PCOS. It works as an insulin sensitiser and is available over the counter.
- Stress management — chronic stress raises cortisol and can worsen hormonal dysregulation; this isn't just "wellness advice" — it has measurable hormonal effects
Medical Treatments for PCOS and Fertility
Letrozole
Now the first-line ovulation induction medication for PCOS, replacing Clomid. Letrozole triggers ovulation in 60–85% of women with PCOS and has better cumulative pregnancy rates with fewer side effects.
Metformin
An insulin-sensitising medication that can restore ovulation in some women with PCOS, particularly those with significant insulin resistance. Often used alongside letrozole.
Gonadotropins (FSH injections)
Injectable hormones used if oral medications don't work. Require careful monitoring to prevent ovarian hyperstimulation syndrome (OHSS). Usually done in a fertility clinic.
IVF
IVF is highly effective for PCOS and is recommended if simpler treatments don't succeed or if there are other fertility factors. Women with PCOS have good egg quantity but need careful monitoring to avoid OHSS.
Tracking Your Cycle with PCOS
Standard cycle tracking apps assume a 28-day cycle and predict ovulation on day 14. For PCOS, this is often completely wrong. More reliable tracking methods include:
- OPKs (ovulation predictor kits) — detect the LH surge that precedes ovulation. Note that in PCOS, LH can be chronically elevated, causing misleading "surges." Digital OPKs that measure the ratio of LH to oestrogen (like Clearblue Advanced Digital) are more reliable than standard OPKs for PCOS.
- BBT charting — confirms ovulation after the fact; useful for knowing whether you ovulated in a given cycle
- Ultrasound monitoring — your doctor can track follicle development and confirm ovulation with a scan
PCOS and Pregnancy Outcomes
Once pregnant, women with PCOS have slightly higher risks of gestational diabetes, pregnancy-induced hypertension, and preterm birth — largely related to the underlying insulin resistance. These risks are reduced by healthy lifestyle management before and during pregnancy. The majority of women with PCOS have straightforward pregnancies.
Track Every Step of Your TTC Journey
Two Pink Lines is a printable planner designed for women trying to conceive — track cycles, ovulation signs, symptoms, appointments, and emotional milestones in one beautiful tracker.