The single most effective thing you can do to increase your chances of getting pregnant is have sex in the three days leading up to ovulation. On the best-timed day (two days before ovulation), the probability of conception is about 26%. By contrast, sex just one day after ovulation drops that chance to roughly 1%. Beyond timing, a combination of diet, exercise, sleep, and attention to both partners’ health can meaningfully improve your odds.
Track Your Fertile Window
You have about a six-day fertile window each cycle, but the three days before the egg is released are by far the most important. Sperm can survive inside the reproductive tract for up to five days, while an egg only lives for 12 to 24 hours after ovulation. That asymmetry is why sex before ovulation works better than sex after.
There are several ways to pinpoint when you’re approaching ovulation. Ovulation predictor kits (available at any pharmacy) detect a hormone surge in your urine about 24 to 36 hours before the egg releases. Basal body temperature tracking can confirm ovulation after the fact, which helps you learn your pattern over a few cycles. But for a no-cost, real-time signal, pay attention to cervical mucus.
In the days after your period, mucus is typically thick, white, and dry. As you approach ovulation, it becomes wet, slippery, and stretchy, often compared to raw egg whites. That slippery texture is your most reliable body-based indicator that you’re fertile right now. After ovulation, the mucus returns to thick and dry. If you notice the egg-white consistency, that’s a strong signal to have sex that day and the next.
How Often to Have Sex
You don’t need to limit sex to preserve sperm count. Every day or every other day during your fertile window gives you the best coverage. Outside the fertile window, regular sex (two to three times a week) keeps sperm fresh and ensures you don’t accidentally miss an early or late ovulation. There’s no evidence that specific positions or lying still afterward makes a difference, despite the widespread advice.
Adjust Your Diet
What you eat can influence ovulation. A large study from Harvard found that women who took a daily multivitamin had roughly one-third lower risk of ovulatory problems compared to those who didn’t, with folic acid appearing to drive most of that benefit. The CDC recommends 400 micrograms of folic acid daily for all women who could become pregnant, primarily to prevent neural tube defects, but the fertility benefit is an added reason to start before you conceive.
Beyond supplements, the dietary pattern that best supports fertility emphasizes whole grains, omega-3 fatty acids, fish, and soy while limiting trans fats and red meat. Trans fats (found in some processed and fried foods) are specifically linked to higher rates of ovulatory infertility. Replacing some animal protein with plant-based protein also appears to reduce ovulatory risk. You don’t need a rigid meal plan. Shifting the balance of what’s on your plate toward these foods is enough to move the needle.
Maintain a Healthy Weight
Body weight affects fertility through its influence on hormones that regulate ovulation. Research on over 16,000 patients found that the probability of a live birth remained stable when BMI stayed below about 23, then began declining above that threshold. Being significantly underweight can also disrupt ovulation by suppressing the hormonal signals that trigger egg release.
If you’re carrying extra weight, even a modest loss of 5 to 10 percent of your body weight can restore more regular ovulation. The goal isn’t a specific number on the scale but getting your body into a range where your cycles become more predictable.
Exercise at the Right Intensity
Moderate exercise supports fertility. A meta-analysis of prospective studies found no negative association between moderate physical activity and the ability to conceive. However, high-intensity exercise (think training for a marathon or doing intense daily workouts that leave you exhausted) was associated with a 16% reduction in fertility compared to the lowest activity levels.
The mechanism is straightforward: very intense exercise can create an energy deficit that disrupts the hormonal chain responsible for ovulation. It delays ovulation, lengthens the first half of the cycle, and shortens the second half, which is the phase critical for a fertilized egg to implant. In extreme cases, it can stop periods altogether. Walking, swimming, cycling at a comfortable pace, yoga, and strength training a few times a week all fall well within the beneficial range.
Protect Your Sleep
Your body’s internal clock directly controls the hormonal cascade that triggers ovulation. The brain’s master clock sends timed signals that ultimately stimulate the release of the hormone responsible for the egg’s release each cycle. When sleep is disrupted or chronically short, those timed signals become unreliable.
Melatonin, the hormone your brain produces in darkness, plays a role in regulating reproductive hormones. Consistently short sleep suppresses melatonin production, which can throw off the timing of ovulation. Aim for seven to nine hours in a dark room, and try to keep your sleep and wake times consistent, even on weekends. If you do shift work, this is worth discussing with your doctor, since irregular schedules are a known disruptor of cycle regularity.
What Your Partner Can Do
About a third of fertility challenges involve the male partner, so this isn’t a one-person project. Several lifestyle factors directly affect sperm count, movement, and quality:
- Smoking is linked to lower sperm counts.
- Heavy alcohol use reduces both sperm count and testosterone.
- Heat exposure from hot tubs, saunas, or prolonged sitting may impair sperm production. Loose-fitting underwear and taking breaks from sitting can help.
- Excess weight is associated with lower sperm count and reduced sperm movement.
- Stress can suppress the hormones needed to produce healthy sperm and reduce interest in sex.
- Toxin exposure to pesticides, lead, and industrial chemicals can lower sperm quantity and quality.
- Certain medications including some blood pressure drugs, antidepressants, opioids, and anabolic steroids can reduce fertility. Your partner should talk to a doctor before stopping any medication, but it’s worth reviewing what they’re taking.
Choose the Right Lubricant
Many standard lubricants interfere with sperm movement. If you need lubrication, look for products specifically labeled “fertility-friendly” or “sperm-friendly,” which must be evaluated by the FDA before they can carry that label. The best options are hydroxyethylcellulose-based, which most closely match natural vaginal mucus in consistency without harming sperm. Avoid lubricants with fragrances or parabens, and don’t substitute household oils like coconut oil. Products labeled simply “organic” or “natural” don’t undergo the same FDA review and may still impair sperm.
When to Seek Help
If you’re under 35 and have been having regular unprotected sex for 12 months without conceiving, it’s time for a fertility evaluation. If you’re 35 or older, that timeline shortens to six months. For women over 40, the American Society for Reproductive Medicine recommends more immediate evaluation. These timelines apply to couples without any known reproductive issues. If you have irregular periods, a history of pelvic infections, endometriosis, or prior surgeries, or if your partner has a known issue, it’s reasonable to seek evaluation sooner rather than waiting out the full timeline.