Having sex every one to two days during your fertile window gives you the best chance of conceiving. That translates to roughly three to six times over the course of about a week. You don’t need to hit an exact number, and more frequent sex doesn’t lower your odds.
The Fertile Window Is Longer Than You Think
Ovulation itself is a single event, but the window where sex can lead to pregnancy stretches across about seven days: the five days before ovulation, the day of ovulation, and the day after. This is because sperm can survive inside the uterus and fallopian tubes for three to five days, waiting for an egg to be released. The egg, by contrast, is only viable for about 12 to 24 hours after ovulation. So sex before ovulation is just as important as sex on the day itself.
The highest-probability days are the two to three days leading up to ovulation and ovulation day itself. Having sex during this narrower peak gives you the strongest odds per cycle, but starting earlier in the window builds a “reserve” of sperm already in position.
Every Day or Every Other Day
The American Society for Reproductive Medicine states that pregnancy rates are highest when couples have intercourse every one to two days during the fertile window. That said, couples who manage sex two to three times per week achieve nearly the same results. The difference between daily and every-other-day sex is small enough that personal preference and comfort should guide the decision.
One persistent myth is that you need to “save up” sperm by abstaining for several days beforehand. While some data suggests sperm concentration peaks after two to three days of no ejaculation, men with normal sperm quality maintain healthy counts and motility even with daily ejaculation. Frequent sex does not meaningfully deplete sperm in most men. The ASRM is explicit on this point: couples should not be advised to limit how often they have sex when trying to conceive.
How to Time It Without Guessing
If you’re not sure when you ovulate, two practical tools can narrow the window. The first is tracking cervical mucus. In the days approaching ovulation, mucus becomes clear, slippery, and stretchy, often compared to raw egg whites. This type of mucus is a direct predictor of conception success, not just a calendar marker. Research published in the European Journal of Obstetrics and Gynecology found that the probability of conception from a single act of intercourse ranged from 0.3% on dry days to roughly 30% on days with the most fertile-type mucus. When you notice this change, it’s a strong signal to start having sex regularly.
The second tool is ovulation predictor kits (OPKs), which detect a surge in luteinizing hormone in your urine. This surge happens about 36 hours before ovulation. A positive result means ovulation is imminent, and starting every-other-day (or daily) sex from that point covers the peak window well. Many couples find it helpful to begin having sex a day or two before they expect a positive OPK, then continue through the day after ovulation.
A Practical Schedule
If your cycle is roughly 28 days and you ovulate around day 14, a realistic approach looks like this: begin having sex around day 9 or 10, then continue every one to two days through day 15 or 16. That covers the full fertile window without requiring precise prediction of the exact ovulation moment. For couples with irregular cycles, leaning on mucus tracking or OPKs is more reliable than counting calendar days.
If every-other-day sex across the full window feels like too much, focus your energy on the three or four days surrounding your mucus peak or positive OPK result. Even two or three well-timed sessions during that narrower stretch put you close to the maximum odds for that cycle.
When Frequency Becomes Stressful
Turning sex into a rigid schedule can create pressure that makes the process harder emotionally and physically. Couples who have regular sex two to three times a week throughout the month, without specifically timing it, still achieve strong conception rates over several cycles simply because they’re likely hitting the fertile window by chance. If tracking and scheduling is adding more stress than structure, stepping back to a “frequent sex all month” approach is a completely reasonable strategy with only a modest trade-off in per-cycle odds.
For couples who find regular frequent sex difficult due to schedules, travel, or other factors, that’s where fertility-awareness methods like OPKs and mucus tracking add the most value. They let you concentrate your efforts into the days that matter most, so even two or three targeted sessions can be enough.