Timing is everything.
Sperm can live for two to three days, but the egg is around for only 12 to 24 hours. To increase the likelihood of conception , schedule intercourse for one to two days before ovulation . That way, there's more likely to be a healthy supply of sperm waiting in the fallopian tube when an egg is released. Of course, exactly when a woman ovulates isn't altogether clear. It all depends on the length of your menstrual cycle .