The single most effective thing you can do is have sex during the six-day fertile window each cycle, ideally every one to two days in the days leading up to ovulation. Most couples with no fertility issues conceive within a few months using this approach. Beyond timing, a handful of lifestyle and nutritional factors can meaningfully shift the odds in your favor.
The Six-Day Fertile Window
Each menstrual cycle has exactly six days when pregnancy is possible: the five days before ovulation and the day of ovulation itself. This window exists because sperm can survive inside the uterus and fallopian tubes for three to five days, while an egg only lives about 12 to 24 hours after it’s released. The goal is to have sperm already waiting when the egg arrives.
The probability of conception is lowest on the first of those six days and climbs steadily, peaking in the two to three days just before ovulation. That means the best strategy isn’t to wait for ovulation and then have sex. It’s to have sex in the days leading up to it so sperm are already in position.
How to Pinpoint Ovulation
Ovulation predictor kits (the urine test strips you can buy at any pharmacy) are the most practical tracking method. They detect the hormone surge that triggers ovulation, and a positive result predicts ovulation within about 48 hours. They’re inexpensive and highly accurate, with sensitivity near 100% in one study of infertile women. The main limitation is that hormone surges vary from person to person, and in a small percentage of cycles a surge can happen without an egg actually being released.
Basal body temperature tracking, where you take your temperature first thing every morning, is often recommended but is surprisingly unreliable. One review found it matched the actual day of ovulation only about 22% of the time, and factors like poor sleep, alcohol, or even a change in room temperature can throw off readings. A 2005 review concluded it should no longer be recommended as a primary method for couples trying to conceive.
Cervical mucus monitoring is free and can be a useful secondary signal. When mucus becomes clear, slippery, and stretchy (often compared to raw egg whites), ovulation is approaching. Studies show this method correlates with ultrasound-confirmed ovulation about 74% of the time. Used alongside ovulation predictor strips, it gives you a solid picture of your fertile window.
How Often to Have Sex
Daily sex and every-other-day sex during the fertile window produce nearly identical pregnancy rates. A large study analyzing almost 10,000 semen samples found that even with daily ejaculation, sperm concentration and motility stayed normal in men with healthy semen. In men with lower sperm counts, daily ejaculation actually produced the best concentration and motility.
The one thing that clearly hurts your chances is having sex only once during the fertile window. Beyond that, the American Society for Reproductive Medicine advises that couples should not limit frequency and should simply go with whatever feels comfortable. Every one to two days during the fertile window gives the highest rates, but two to three times per week is nearly as effective. The worst thing you can do is turn sex into a rigid schedule that creates stress for either partner.
Lubricants Can Be a Problem
Many common lubricants significantly reduce sperm motility. Lab studies found that products like Astroglide, KY Jelly, and Replens rendered sperm immotile within 15 minutes of contact. If you use lubricant, look for one specifically labeled “fertility-friendly.” Pre-Seed is one brand that has been tested and shown not to affect sperm motility in laboratory conditions.
Lifestyle Changes That Improve Your Odds
For Both Partners
Smoking reduces sperm concentration, motility, and morphology in men, and one study found that DNA damage in sperm was roughly double in infertile smokers compared to infertile nonsmokers. For women, smoking is similarly harmful to egg quality. Quitting is one of the highest-impact changes either partner can make.
Alcohol decreases fertility for both sexes. In women, chronic use has been linked to lower ovarian reserve markers. One study of women undergoing fertility treatment found that those who drank alcohol were nearly three times less likely to achieve pregnancy.
Caffeine in moderate amounts (under 200 mg per day, roughly one 12-ounce coffee) appears to be fine. Above 500 mg per day, roughly five cups, there’s evidence it can delay conception and interfere with implantation.
For Women
Body weight matters more than many couples realize. Excess body fat raises insulin levels, which can disrupt ovulation by triggering excess androgen and estrogen production. The body can essentially interpret this hormonal environment as a signal not to conceive. Women who are significantly overweight and not ovulating regularly have been shown to increase their natural conception rate through lifestyle changes that reduce body fat, even modest ones.
Start taking 400 micrograms of folic acid daily now, before you conceive. This is the dose the CDC recommends for all women who could become pregnant, and it’s critical for preventing neural tube defects in the earliest weeks of pregnancy, often before you even know you’re pregnant. A standard prenatal vitamin covers this.
For Men
Antioxidant supplements have solid evidence behind them for improving sperm quality, particularly in men with suboptimal semen parameters. A combination of vitamin C, vitamin E, and CoQ10 has been shown across multiple studies to improve sperm count, motility, and morphology. In one study, men who took selenium and vitamin E daily for at least 100 days saw a 52.6% overall improvement in sperm quality, and 10.8% achieved spontaneous pregnancy during the study period.
Zinc supplementation has also shown benefits. In one trial, men who took zinc daily for three months saw increases in semen volume, progressive motility, and total normal sperm count. CoQ10 on its own, at doses of 150 to 200 mg daily, improved sperm density, motility, and morphology in several controlled trials, with results typically appearing after three to four months of consistent use. Sperm take roughly 74 days to fully develop, so any supplement or lifestyle change needs at least two to three months to show results.
When the Timeline Matters
About 85% of couples conceive within a year of trying, but age significantly affects how quickly you should expect results. For women under 35 with regular cycles, the general guideline is to try for a full year before seeking evaluation. For women 35 and older, that drops to six months. Women over 40 should consider evaluation sooner rather than later, since egg quality and quantity decline more sharply after that point.
If you already know about irregular periods, a history of pelvic infections, endometriosis, or prior surgeries, or if the male partner has a known issue with sperm, there’s no reason to wait the standard timeline before getting checked out. A basic fertility workup is straightforward and can rule out common, treatable problems early.