What to Do 3 Months Before Trying to Conceive

If you're asking what to do 3 months before trying to conceive, you're already ahead of most people I see. The egg released the month you actually conceive started maturing roughly 90 days earlier, which means the food, sleep, and supplements of the next 12 weeks sit inside that egg. This post walks through the window step by step, from an OB-GYN's view, with both UK and US guidance built in.

A quick honesty check before we start. Three months won't undo every risk factor, and nothing on this list is a guarantee. What it does do is stack the odds. If you'd like the longer roadmap that sits above this post, see our full pre-conception health checklist.

The 90-day egg quality window, what it really means

The 90-day egg quality window is shorthand for folliculogenesis. The cohort of follicles your ovary recruits for any given cycle has been quietly developing for around three months before one of them ovulates. ^[src]

That's the window of influence. It's not magic and not a guarantee. But the eggs that mature in a calmer, better-nourished body are the ones you want at the ovulation finish line.

That couple framing matters. Patients who come to me focused only on their own bloods and supplements are sometimes surprised that the male side moves the needle just as much.

Pre-conception supplements, what to start now

Pre-conception supplements should be boring and evidence-led, not a £90 boutique stack. Start the basics now and you've covered most of the gain.

Folic acid. The NHS recommends 400 micrograms daily from before conception until 12 weeks of pregnancy. A higher 5 milligram dose is advised if your BMI is over 30, if you have diabetes or epilepsy on certain medications, or if there's a personal or family history of a neural tube defect. ^[src] CDC guidance is similar, with 400 to 800 micrograms as a baseline.

Vitamin D. The UK standard is 10 micrograms daily year-round, more if you're darker-skinned, cover up for cultural reasons, or live somewhere with little sun. Low vitamin D is one of the most common deficiencies I see in pre-conception bloods, especially across the South Asian diaspora where it tends to run lower across populations.

Iodine. Often missed. Iodine sits in thyroid hormones, which build the baby's brain. A standard prenatal that meets your country's guideline is usually enough.

Iron only if your ferritin is low, and CoQ10 and omega-3 have softer but reasonable evidence for egg quality and pregnancy outcomes respectively. Skip mega-doses of vitamin A in pregnancy.

Does diet 3 months before pregnancy matter? Yes, more than most people expect. A Mediterranean-pattern diet, oily fish, leafy greens, legumes, olive oil, nuts, sits behind better fertility and pregnancy outcome data than any single supplement. If your kitchen runs on Bengali, Pakistani, or Indian staples, you're already close: dal, fish, leafy saag, brown rice, yoghurt, and home-cooked vegetables fit the pattern well.

What to stop: alcohol, caffeine, smoking, and certain meds

The "stop alcohol caffeine pre-TTC" rule isn't about being puritanical. It's about removing exposures the egg and a future embryo don't need.

Alcohol. UK guidance is zero alcohol in pregnancy. Since you may not know you're pregnant for the first few weeks, it's reasonable to stop or substantially cut down now.

Caffeine. Keep total caffeine under 200 milligrams a day during the TTC window and pregnancy. That's roughly two mugs of instant coffee, or one strong filter coffee plus a tea.

Smoking and vaping. Stopping smoking before conception lowers miscarriage and stillbirth risk. The NHS Stop Smoking service is free and effective. ^[src]

Medication audit. Book a 10-minute GP review of every prescription, OTC product, and herbal supplement you take. Acne medications like isotretinoin, certain mood stabilisers, some blood pressure drugs, and high-dose herbal blends all need a plan before TTC, not after a positive test.

Tests and check-ups to schedule in months 1 and 2

What to start 3 months before TTC includes a tidy round of bloods and screening. Most are free on the NHS if you're due, and inexpensive privately if you're not.

• Cervical screening if it's due
• Rubella and varicella immunity (live vaccines need to be done before conception, not during)
• Thyroid (TSH), with a free T4 if symptoms
• HbA1c if you have PCOS, BMI over 30, or a family history of diabetes
• Ferritin and full blood count
• Blood pressure and a calm BMI conversation
• A dental check, gum disease is linked to worse pregnancy outcomes

If you're in the UK, ask your GP about a pre-conception appointment. Many practices will run pre-pregnancy blood tests in the UK at this visit.

Lifestyle resets: sleep, stress, movement, weight

Sleep is the unglamorous half of the 90-day egg quality window. Aim for 7 to 9 hours. Melatonin, the hormone released as you fall asleep, doubles as an antioxidant inside the ovary and supports egg quality.

Stress is real but it's not "just relax and it'll happen". Cortisol affects the hypothalamic-pituitary-gonadal axis in measurable ways, which is why people often conceive on the holiday after a hard year. You don't need to manufacture calm. You do need to protect basic recovery: fewer late nights, more daylight walks, less doomscrolling at 11pm.

Movement guidance is the standard 150 minutes a week of moderate activity, with a couple of strength sessions if you can. Avoid starting an extreme new training programme in this window.

Weight is the conversation patients dread most, so I'll keep it kind and accurate. The lowest-risk BMI band for conception and pregnancy sits roughly between 19 and 29. Above or below that, fertility and pregnancy risk both rise, but small sustainable changes matter more than dramatic ones. If this part feels loaded, see our piece on how weight affects pre-conception fertility.

What this means for you

Three months before trying to conceive is genuinely the most useful window you have, and what to do 3 months before trying to conceive is mostly unspectacular: take folic acid, line up bloods, cut alcohol and tobacco, protect sleep, and have one honest GP or PCP conversation. The 90-day egg quality window will close whether or not you fill it well, and a small, consistent plan beats a perfect one you abandon by week three.

If anything on this list feels unclear, or you want a tailored 90-day plan that accounts for PCOS, thyroid, a previous loss, or a long TTC history, that's the kind of question we work through in a 30-minute online consult.