To fall pregnant, have regular unprotected sex every 2–3 days throughout your cycle — timing it around ovulation (roughly 12–16 days before your next period) gives you the best chance each month. Start taking 400 micrograms of folic acid daily before you conceive, maintain a healthy weight, and both partners should avoid smoking and limit alcohol. Around 84% of couples conceive within a year of trying.
Understanding Your Fertile Window
You can only fall pregnant during a short window each cycle: the day of ovulation and the five days before it, because sperm can survive in the reproductive tract for up to five days while the egg lives for just 12–24 hours after release. Ovulation usually happens around 12–16 days before your next period starts — so in a typical 28-day cycle, the fertile window falls roughly between days 9 and 14.
That said, cycles vary, and ovulation does not always follow the textbook. Rather than trying to pinpoint a single day, the NHS advice on trying for a baby recommends having sex every 2–3 days throughout the month. This approach covers the fertile window without the stress and guesswork of calendar-tracking, and research shows it is just as effective as timed intercourse for most couples.
Preparing Your Body Before You Conceive
Preconception health matters more than many people realise — the first weeks of pregnancy are critical for development, often before you even know you have conceived.
Start Folic Acid Now
Take 400 micrograms of folic acid every day from the moment you start trying until you are 12 weeks pregnant. It dramatically reduces the risk of neural tube defects such as spina bifida. Most standard preconception supplements contain the right dose, and you can buy them cheaply at any UK pharmacy or supermarket. If you have diabetes, epilepsy, a BMI over 30, or a previous pregnancy affected by a neural tube defect, your GP may prescribe a higher 5mg dose.
Reach a Healthy Weight
Both underweight and overweight can disrupt ovulation and make it harder to fall pregnant. A BMI between 18.5 and 24.9 supports regular cycles and healthy hormone levels. You do not need a dramatic transformation — even a 5–10% weight loss can restore ovulation in women with polycystic ovary syndrome (PCOS).
Review Medicines and Health Conditions
Book a preconception appointment with your GP, especially if you take regular medication, have a long-term condition such as diabetes, thyroid disease, epilepsy or high blood pressure, or are over 35. Some medicines need adjusting before pregnancy, and conditions like diabetes are safest when well controlled before conception. Make sure your rubella immunity is up to date — your GP can check with a blood test and vaccinate you if needed, ideally at least a month before trying.
Lifestyle Changes That Boost Fertility
Small, consistent changes from both partners can meaningfully improve your chances of falling pregnant.
- Stop smoking: smoking damages eggs and sperm, disrupts hormones, and is linked to miscarriage and ectopic pregnancy. The NHS Stop Smoking service offers free support — ask your GP or pharmacist.
- Limit alcohol: the UK Chief Medical Officers advise avoiding alcohol entirely when trying to conceive and during pregnancy, as no safe level has been established.
- Cut back on caffeine: high intakes have been linked to reduced fertility; keep it moderate while trying.
- Eat well: a balanced diet rich in fruit, vegetables, wholegrains and oily fish supports reproductive health. There is no magic “fertility diet”, but severe restriction or crash dieting can stop ovulation.
- Exercise moderately: regular moderate activity is beneficial, but very intense training combined with low body weight can disrupt cycles.
- Manage stress: while stress alone rarely causes infertility, the pressure of trying can strain relationships — be kind to each other and seek support if you need it.
What About the Male Partner?
Fertility is a two-person equation — male factors contribute to around half of all cases where couples struggle to conceive. Sperm health responds to lifestyle: men should also stop smoking, keep alcohol within 14 units a week, maintain a healthy weight, and avoid overheating the testicles (very hot baths, saunas, and laptops balanced on laps for hours). It takes around three months for new sperm to mature, so improvements show after a season of healthier habits. Boxers versus briefs makes little difference, despite the folklore. If conception is taking a while, a simple semen analysis through your GP is a quick, non-invasive first check.
Tracking Ovulation: Helpful Tools
If you want more precision than the every-2–3-days approach, ovulation predictor kits (OPKs) detect the luteinising hormone surge 24–36 hours before ovulation and are sold in most UK pharmacies. Basal body temperature charting and cervical mucus monitoring (clear, stretchy “egg-white” mucus signals approaching ovulation) are free alternatives. Fertility tracking apps can help you spot patterns, but treat their predictions as estimates — studies show many apps are unreliable at pinpointing ovulation. Use tracking as a guide, not a source of pressure.
When to Seek Help
Most couples conceive naturally, but do not wait indefinitely if it is not happening. The NHS recommends seeing your GP if you have not fallen pregnant after one year of regular unprotected sex — or after six months if you are over 36, since fertility declines more quickly from the mid-30s. Seek help sooner if you have irregular or absent periods, known PCOS or endometriosis, a history of pelvic infection, testicular problems, or previous cancer treatment.
Your GP can arrange initial investigations: blood tests to confirm ovulation, a semen analysis for your partner, and possibly a chlamydia screen. Depending on results, you may be referred to a fertility clinic. In England, eligible couples can access NHS-funded IVF — typically three cycles if you meet local criteria, though availability varies by area. The NHS guide to IVF explains who qualifies and what to expect.
Trying to Conceive After 35
Female fertility declines gradually from the early 30s and more steeply after 35, mainly because both egg quantity and quality fall with age. This does not mean pregnancy becomes unlikely — most women over 35 who try do conceive — but it can take longer, and the chance of miscarriage rises. If you are 36 or older, seek GP advice after six months of trying rather than a year, so investigations and any treatment start sooner. Preconception health matters even more with age: folic acid, a healthy weight, no smoking and well-managed long-term conditions all improve the odds. Men are affected too — sperm quality declines gradually from the 40s — so male partners should adopt the same healthy habits. Whatever your age, the fundamentals in this guide still apply; the main difference is simply not waiting as long before asking for help.
Frequently Asked Questions
How long does it usually take to fall pregnant?
Around 84% of couples conceive within one year of regular unprotected sex, and about 92% within two years. Age is the biggest factor — fertility starts to decline gradually from the early 30s and more steeply after 35.
Does lying down after sex help you conceive?
There is no strong evidence that lying still, elevating your hips, or any particular position improves the odds. Sperm reach the cervix within seconds of ejaculation, so you can carry on as normal.
Can stress stop you falling pregnant?
Everyday stress is unlikely to prevent conception on its own. However, chronic severe stress can occasionally disrupt ovulation, and the emotional strain of trying can affect libido and frequency of sex — which does matter. Support each other and consider counselling if trying is taking a toll.
Should I stop contraception in advance?
You can start trying as soon as you stop most contraception — fertility typically returns quickly after stopping the pill, patch or ring. After the contraceptive injection, it can take several months for cycles to return, so plan accordingly. The copper coil and implant do not delay fertility once removed.
At what age should I see a GP sooner?
If you are 36 or older, see your GP after six months of trying rather than a year. If you are over 40, consider seeking advice even earlier, as fertility declines significantly and timely investigation gives you more options.
Conclusion
Falling pregnant usually comes down to regular unprotected sex every 2–3 days, good preconception health — folic acid, healthy weight, no smoking — and patience, since most couples conceive within a year. Both partners’ habits count, and tracking ovulation is optional rather than essential. If a year has passed (or six months if you are over 36), see your GP for straightforward initial tests and a referral if needed. Support is available on the NHS, so you never have to navigate a difficult journey alone.
