90 Day Plan Before Trying to Conceive: Couples Week by Week

You and your partner have decided you want to start trying in roughly three months. You have read about the window, the supplements, the labs, and you want a single 90 day plan before trying to conceive that you can both follow. This is that plan. It is a couples' protocol, mapped onto a 12-week calendar, designed to be pragmatic rather than perfect.

The short version. Both partners start on Day 1. The plan begins with the highest-evidence inputs (folate, smoking cessation, alcohol reduction, heat exposure for the sperm-producing partner), layers in labs and adjustments based on results, and ends with a pre-trying check at Week 12. This is a roadmap, not a substitute for clinical care; it is designed to be layered with your GP or RE rather than to replace them.

How to use this 90 day plan before trying to conceive

Both partners follow the plan from Day 1. The 90-day window is a couples' intervention, not a female-partner one. The biology behind that is in the pillar post, why the 90 days before trying matter most.

Adjust for personal circumstances. PCOS, age 35 or older, known male factor, prior pregnancy loss, and pre-existing medical conditions change the plan in specific ways. Notes through the post flag where the plan needs to bend.

This is a roadmap, not a substitute for clinical care. If you have known fertility factors, the plan runs alongside specialist care, not instead of it.

Week 0: set up (the week before Day 1)

A short setup week before the formal Day 1 makes the rest of the plan easier.

1. Book a pre-conception GP appointment for both partners. Use the language: "we are planning to try to conceive in the next 3 to 6 months and would like a medication review, vaccinations check, and baseline labs."
2. If either of you already has a fertility consultant, book a parallel appointment with them.
3. Order any home tests you want delivered (private OGTT, vitamin D, semen analysis kit) so they arrive by Week 2.
4. Buy a quality prenatal that includes 400 micrograms of folate (folic acid or methylfolate), 150 micrograms of iodine, 10 to 25 micrograms (400 to 1000 IU) of vitamin D, and choline. See prenatal vitamins, when and which.
5. Each partner writes down honest baseline numbers for the lifestyle variables: weekly alcohol units, average sleep duration, smoking status, caffeine intake, exercise minutes per week. Honesty here makes the plan work; rounding down makes it cosmetic.

Weeks 1 to 2: start the highest-yield inputs

The first fortnight is about installing the changes with the most evidence, before adding anything optional.

Both partners

• Start the prenatal or male fertility multivitamin on Day 1. Folate is the headline. The MRC Vitamin Study established the benefit of periconception folate for neural tube defect prevention.³
• Stop smoking. This is the single highest-impact change either partner can make, and it has measurable effects on both female and male fertility within weeks to months.
• Stop cannabis and any recreational drug use.
• Cut alcohol to within sensible TTC limits (typically 7 units per week or less, with no binge drinking) and ideally toward zero in the female partner once trying begins. See caffeine and alcohol TTC limits.
• For the sperm-producing partner: drop the heat-exposure habits. No saunas, no hot tubs, no daily hot baths, no laptop on lap for prolonged work. See hot tubs, saunas, and sperm.
• Adopt the Mediterranean dietary pattern as the default: olive oil as primary fat, fish 2 to 3 times per week, legumes 3 to 5 times per week, vegetables at both main meals, less ultra-processed food. See the Mediterranean diet and TTC.

Female partner

• Add vitamin D 1000 to 2000 IU per day if you have not been tested recently or are known to be low. See vitamin D and fertility.
• If you have PCOS: start inositol at 4 g/day myo plus 100 mg/day D-chiro (40:1 ratio). See myo-inositol and PCOS.

Male partner

• Start a male fertility multivitamin containing zinc, selenium, vitamin E, vitamin C, and ideally CoQ10 and folate. See male fertility supplements: what works.
• If there is a borderline semen analysis history or the partner is 35 or older: CoQ10 200 to 300 mg/day specifically. See CoQ10 and male fertility.

Labs to obtain in this window

• Both partners: blood pressure, BMI baseline, full blood count.
• Female partner: TSH, ferritin, vitamin D, HbA1c (or fasting glucose), rubella and varicella immunity, HIV/syphilis/hepatitis screening if not recent. For PCOS-aware planning, add fasting insulin and a 75 g OGTT. See PCOS, insulin resistance, and fertility.
• Male partner: a semen analysis (with 2 to 7 days of abstinence) if not previously normal, or if there is any risk factor (prior testing concerns, varicocele, prior chemotherapy, mumps orchitis, undescended testis).

Weeks 3 to 4: adjust based on labs

By Week 3 or 4, the initial labs should be back. The plan now responds to what they show.

• Vitamin D deficient (below 50 nmol/L or 20 ng/mL): increase to 4000 IU/day for 8 to 12 weeks, then retest.
• TSH outside 0.4 to 2.5 mIU/L: discuss with your clinician. The preconception range used in many clinics is tighter than the general adult reference range, particularly with a personal or family history of thyroid disease.
• Ferritin under 30 micrograms/L: discuss iron supplementation, taken with vitamin C, and address dietary iron. Ferritin under 15 needs more urgent management.
• HbA1c above 42 mmol/mol (6.0 percent): discuss with your clinician. Above 48 (6.5 percent) needs management before TTC.
• PCOS reader with OGTT in pre-diabetes range: discuss metformin with your clinician. See PCOS, insulin resistance, and fertility.
• Abnormal semen analysis: layer in the lifestyle backbone (see lifestyle habits that hurt sperm and hot tubs, saunas, and sperm) and book a repeat SA at Week 14.

Lifestyle additions

Now is when the secondary lifestyle inputs go in, layered on top of the Week 1 to 2 changes.

• Move toward 150 minutes per week of moderate aerobic activity plus 2 resistance sessions per week. The WHO guideline anchors this baseline.⁶ See exercise and TTC, how much is too much.
• Protect 7 to 8 hours of sleep with a consistent bedtime. See sleep, stress, and fertility.

Weeks 5 to 6: operational

The middle of the plan is about turning Week 1 to 2 changes from "started" to "habitual." That is where most plans wobble.

Diet refinement

• Audit ultra-processed foods, sugary drinks, and trans-fat snacks. Reduce one category at a time rather than all at once.
• Add an additional legume meal per week if not already there. Legumes have one of the cleanest signals in the Chavarro ovulatory fertility data.⁵
• Protein and fibre before carbohydrate at each meal. This matters particularly for PCOS.

EDC swaps: the only place these belong

Endocrine-disruptor swaps are most useful when they are small, low-effort, and high-yield. The full conversation is in endocrine disruptors, plastics, and BPA.

• Replace warped or visibly damaged non-stick pans.
• Switch the daily water bottle to glass or stainless steel.
• Stop microwaving food in plastic.
• Audit one personal care product for "fragrance" and switch to fragrance-free.

That is enough. Replacing every plastic container in one weekend is not a higher-yield intervention than these specific changes.

Cycle literacy (female partner)

• Start tracking cycle length and rough symptoms. Day 1 of the next period is the day of full red flow.
• OPK or BBT can be added later if useful, but they are not mandatory yet. The aim of this window is data for the doctor conversation, not optimisation of cycle timing.

Weeks 7 to 8: sleep, stress, and the partner-level conversation

• Reassess sleep adherence honestly. If the bedtime is slipping back, this is the week to renegotiate it rather than to add a sleep supplement.
• Address any chronic, untreated stress, anxiety, or low mood. Therapy is part of fertility care, not separate from it; mental health treatment in the pre-trying window is one of the highest-yield interventions for the cycle ahead. See sleep, stress, and fertility.
• Couple conversation: how will we handle the trying window? Who is responsible for what (tracking, appointments, supplements)? Calendar agreement on when to start.
• If you have PCOS and your cycles are anovulatory, this is the week to discuss letrozole or clomiphene planning with your clinician. Do not wait until Day 1 of trying to start that conversation.

Weeks 9 to 10: review and re-test

• Vitamin D: retest if started at a deficient level. Adjust dose based on result.
• HbA1c or OGTT in PCOS readers: retest at the clinician's recommendation if you have changed metformin, inositol, or dietary pattern significantly.
• Semen analysis: book for Week 12 to 14 if the first SA was abnormal or if there were risk factors.
• Update vaccinations. Rubella, varicella, MMR titres if borderline; COVID and seasonal flu if due. Live vaccines need to be given before conception, not during early pregnancy.

Weeks 11 to 12: pre-trying check

The final two weeks are the pre-trying check.

• Pre-conception appointment with your GP or RE if not already done. This is the appointment to confirm medication review, finalise lab follow-up, and discuss any specific concerns.
• Confirm both partners are on stable prenatal or male multivitamin.
• Confirm lifestyle changes are sustainable. You will be living with them through pregnancy.
• Discuss when in the cycle to actively start trying. Many couples align with Day 1 of the next menses for tracking simplicity; others start in the next fertile window. Either is reasonable.

What to ask before Day 1 of trying

Specific questions that open the right conversation:

"Given my history, is there anything specific to monitor in the first cycle of trying?"

"If I do not conceive after X cycles, when do we re-evaluate and what would the next workup look like?"

"Are there any of my current medications that I should adjust, change, or stop now?"

For age 35 or older, the X in the second question is typically 6 cycles. Under 35, it is typically 12 cycles. Earlier evaluation is appropriate with known risk factors, oligomenorrhoea, or a partner with a known concern.

If you have less than 90 days

Most couples do not have a perfect three-month window. Compress the plan in this order:

1. Folate and a quality prenatal today. The neural tube closes very early, and partial coverage matters.
2. Treat known conditions (thyroid, anaemia, PCOS, varicocele) in parallel with everything else.
3. The Week 1 to 2 actions (stop smoking, cut alcohol, drop heat exposure, start the diet shift) all still help on a shorter timeline.
4. Less than 30 days: do the basics today. Do not panic-add supplements that need 8 to 12 weeks to act.

What this plan is NOT

For clarity:

• A guarantee of conception within a specific timeframe.
• A substitute for clinical care if known fertility factors are present.
• An invitation to over-engineer your lifestyle to the point of stress.
• A reason to delay seeing a doctor if you have known concerns.

The plan is a starting structure. Where your case differs, the structure bends.

What to do this week

Wherever you are in the plan, the next concrete steps look similar.

1. Start the prenatal today, if you have not.
2. Book the GP appointment for both partners.
3. If either partner smokes, start the cessation plan today (not next week).
4. Drop the largest heat-exposure habit for the sperm-producing partner.
5. Pick one dietary change you can sustain for a year and start it tomorrow.
6. Write down your current sleep duration honestly for the next seven days. Protect a bedtime that gives you 7 to 9 hours.

When to involve your clinician

• Known fertility factors (PCOS, endometriosis, prior surgery, recurrent loss, abnormal SA, age 35 or older). The plan runs alongside specialist care, not instead.
• Pre-existing medical conditions (type 1 or 2 diabetes, thyroid disease, autoimmune conditions, hypertension). Medication review before TTC is essential; some medications need to be changed.
• Current GLP-1 agonist use. Plan the stop with the prescriber at least 2 months ahead. See losing weight with PCOS.
• Mental health concerns (depression, anxiety, prior eating disorder, PTSD around medical care). Address these before TTC starts; that is part of fertility care.

You are not doing this alone, and this 90 day plan before trying to conceive is not asking you to be perfect. The next 90 days are how you arrive at Day 1 of trying with the variables you can control already moving in the right direction.

What's next

• If you want the biology behind the plan: why the 90 days before trying matter most
• If you want the female supplement detail: the preconception supplement stack
• If you want the male supplement detail: male fertility supplements: what works
• If diet is your next question: the Mediterranean diet and TTC and the evidence behind the fertility diet
• If PCOS is part of your picture: PCOS, insulin resistance, and fertility and myo-inositol and PCOS
• If you are entering the trying window soon: trying-naturally section of the library for cycle tracking and timed intercourse

Sources

1. Stephenson J, Heslehurst N, Hall J, et al. Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health. Lancet 2018;391(10132):1830-1841. https://doi.org/10.1016/S0140-6736(18)30311-8
2. Fleming TP, Watkins AJ, Velazquez MA, et al. Origins of lifetime health around the time of conception: causes and consequences. Lancet 2018;391(10132):1842-1852. https://doi.org/10.1016/S0140-6736(18)30312-X
3. MRC Vitamin Study Research Group. Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. Lancet 1991;338(8760):131-137. https://doi.org/10.1016/0140-6736(91)90133-A
4. Teede HJ, Tay CT, Laven JJE, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Fertility and Sterility 2023;120(4):767-793. https://doi.org/10.1016/j.fertnstert.2023.07.025
5. Chavarro JE, Rich-Edwards JW, Rosner BA, Willett WC. Diet and lifestyle in the prevention of ovulatory disorder infertility. Obstetrics & Gynecology 2007;110(5):1050-1058. https://doi.org/10.1097/01.AOG.0000287293.25465.e1
6. World Health Organization. WHO laboratory manual for the examination and processing of human semen, 6th edition. Geneva: WHO; 2021. https://www.who.int/publications/i/item/9789240030787
7. National Institute for Health and Care Excellence. Pre-conception advice and management. NICE Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/pre-conception-advice-management/