Apr 30, - Many people wonder if having sex during menstruation has side effects. There is no health-related reason to avoid sex because someone is Is it safe? · Can you get pregnant? Yes, you can have sex when you're on your period. Also, while it's very unlikely, it's still possible to get pregnant if you have unprotected sex during your period. This is because some women ovulate early, and sperm can survive inside a woman's body for up to 7 days.