If you have had unprotected sex, find out when you can do a pregnancy test. If you have sex during your period you can't get pregnant. So you could be fertile very early in your cycle when you are still bleeding. If you forget to start the next pack of contraceptive pills after the 7-day break, you can't get. How do you feel about having sex while I'm menstruating? Pregnancy can happen if you have sex before, during or after your period. Have you ever wondered why your sex drive fluctuates throughout each month? Share It comes in waves Sex Not only can regular sex make your period more regular, it can lighten your periods and lessen your period symptoms too. If one is about to menstruate, sex can make period blood exit the body sooner because orgasm causes uterine contraction that are similar to the.