She ovulated on paper. She still wasn't getting pregnant.

Persona

Ada, 40, Female, Nigerian British, Secondary school teacher.

Ada was diagnosed with PCOS two years ago after 14 months of trying to conceive with no success. She had irregular cycles ranging from 45 to 90 days and rarely ovulated without medication. One round of Clomid produced a large lead follicle but no confirmed pregnancy. She switched to letrozole, produced two follicles, but the cycle ended with a chemical pregnancy at 5 weeks. Her fertility specialist says her labs are 'going in the right direction.' Ada wants to understand why her ovaries respond unevenly and what her genetics might add to the conversation.

Family history: Mother: PCOS, conceived both children with fertility treatment. Maternal grandmother: type 2 diabetes at 55. No known miscarriage history on either side.

Clinical picture

Symptoms

• Cycles ranging 45–90 days, rarely ovulates without ovulation induction
• Moderate acne on jaw and upper back
• Mild hirsutism — upper lip and chin
• One chemical pregnancy after letrozole cycle
• Weight stable, BMI 27.2

Labs

• LH: 18.2 IU/L (2–15 IU/L (follicular))
• FSH: 5.8 IU/L (3–10 IU/L)
• LH:FSH ratio: 3.1 (<2 preferred)
• Fasting Insulin: 19 µIU/mL (<10 µIU/mL)
• HOMA-IR: 4.1 (<2.5)
• AMH: 8.7 ng/mL (1.0–4.0 ng/mL typical)
• Homocysteine: 13.4 µmol/L (<10 µmol/L optimal)
• Vitamin B12: 298 pg/mL (>400 pg/mL optimal)

Medications

• Letrozole 2.5 mg (days 3–7) — current cycle
• Prenatal vitamin with folic acid

Supplements

• Myo-inositol 2g/day (started 3 months ago)

Lifestyle

• BMI 27.2, walks daily but no structured exercise
• Diet: home-cooked most days, occasional high-carbohydrate comfort eating around cycle stress
• Non-smoker, no alcohol while trying to conceive
• Sleep: 7–8 hours, disrupted in the week before a delayed period

Genetics

• LHCGR LH receptor sensitivity variant (Increased LH receptor sensitivity pattern): Her ovaries may over-respond to the LH surge. That can push follicles to luteinize — mature prematurely — before the egg is ready, which helps explain the uneven response to ovulation-induction cycles.
• INSR Insulin receptor signaling variant (Reduced insulin signaling efficiency): Her cells require more insulin to move glucose effectively, which drives extra androgen production in the ovary and suppresses the proteins that would keep testosterone bound and inactive.
• MTHFR C677T (C/T — one copy, moderately reduced folate activation): Her prenatal folic acid may not fully convert to the active form her body needs, particularly with B12 already running low. Elevated homocysteine supports this bottleneck.
• DENND1A PCOS ovarian androgen variant (Risk allele carrier): Her ovaries have a genetic tendency to amplify androgen production when insulin and LH signals rise — which in her case, both do. This is likely part of why her PCOS presents with strong androgen symptoms alongside the ovulation problem.

The follicles were there. The pregnancies weren't.

Ada did everything right by the standard checklist. She took her medication on the right days, came in for her monitoring scans, and watched the follicle grow on the ultrasound screen. She left feeling hopeful. The Clomid cycle produced nothing. The letrozole cycle produced a positive test that disappeared at five weeks. Her numbers were trending better, she was told. The plan was to try again. What she wanted was a better explanation for why the follicles that appeared on screen were not becoming the pregnancies she expected.

PCOS infertility is not one problem

PCOS-related infertility often gets simplified into 'she doesn't ovulate,' which is true but incomplete. The mechanisms that disrupt ovulation also affect egg quality, the hormonal environment around the follicle, the lining that receives a fertilized egg, and the early signaling of a new pregnancy. Ada's PCOS isn't just an ovulation problem. It's an LH problem, an insulin problem, a methylation problem, and possibly an early luteal phase problem — each one tugging at the others.

The LH:FSH ratio was the clue the ultrasound confirmed

Ada's LH was running more than three times her FSH — a ratio that reflects the hormonal imbalance underlying PCOS. High LH tells the ovaries to make more androgen and pushes the final maturation signal earlier than it should arrive. If her LHCGR receptor is also more sensitive to that already-elevated LH signal, the follicle can luteinize before the egg inside is ready to fertilize or implant. A large follicle on scan can look like success while the biology underneath has already moved past the window.

The chemical pregnancy pointed to the lining, not just the egg

A chemical pregnancy — a positive test that disappears before ultrasound confirmation — can mean the egg fertilized but the embryo couldn't implant or sustain itself. Ada's homocysteine is elevated, her B12 is suboptimal, and her MTHFR C/T result means folic acid conversion may be incomplete. Homocysteine has a direct effect on the endometrial environment in early implantation studies. Her prenatal vitamin contains folic acid, not methylfolate. The chemical pregnancy may be telling a story about the lining that the Clomid cycle — which ended without a pregnancy at all — never had the chance to tell.

Five conversations to have before the next cycle

• Ask the fertility specialist to review the LH:FSH ratio and discuss whether LH suppression — a GnRH agonist protocol, or monitoring for premature LH surge during the next stimulation — would reduce premature luteinization risk.
• Switch from folic acid to methylfolate (400–800 µg 5-MTHF) and add a B12 supplement. Then recheck homocysteine before the next medicated cycle. The goal is to normalize the lining environment before another transfer attempt.
• Review the inositol dose and form with the specialist. Myo-inositol at 4g/day with 400 µg D-chiro-inositol is the more studied ratio for PCOS insulin signaling. Three months of consistent use tends to show measurable LH and insulin changes.
• Add two to three resistance training sessions per week. Muscle is the primary glucose disposal site after meals; building muscle insulin sensitivity directly reduces the fasting insulin that drives androgen and LH excess.
• Ask about a progesterone check at 7 days post-ovulation on the next cycle to assess whether the luteal phase is adequate. LH hypersensitivity can cause luteal phase deficiency even when ovulation occurs.

Ada's pre-cycle preparation goal

Methylfolate + B12 + inositol protocol before next monitoring scan. Ada used the gap before her next scheduled cycle to address the modifiable methylation and insulin findings. Her goal was to arrive at the next scan with homocysteine trending down and a fuller pre-cycle baseline.

• Week 1: Switched to methylfolate prenatal. Added B12 1000 µg sublingual. Inositol dose increased.
• Week 2: First resistance training session. Felt manageable. Sleep improving slightly.
• Week 3: Homocysteine recheck booked. Wrote down questions for fertility specialist.
• Week 4: First fully consistent week. Protocol feels like something she controls, not just waits through.