There’s no evidence that it makes a difference, but it can’t hurt. Remaining horizontal for 15 minutes or so after intercourse allows more semen to remain in your vagina. Of course, with millions of sperm in every ejaculation, there should be plenty of sperm in your vagina even if you get up right away.

NOTE: If you’ve been trying to conceive for a year or more without success (or three to six months if you’re 35 or older), or your periods are irregular, your best bet is to see a fertility specialist.