Grace Period

M, AGE 27: If you have sex while you’re on your period, there’s absolutely no way for you to get pregnant. Think about it. You’re bleeding. Where is the egg going to go? It’s like a totally inhospitable landscape in there. EVE ESPEY, MD: Eggs can find an oasis in any landscape. The truth is, there’s no absolutely safe time. For one thing, not every episode of bleeding is an actual period. So just remember to be covered 100 percent of the time.