Sex right after a period. This is the time of the month when you're most likely to get pregnant. 02.12.2018 Goltimi Heart Disease. Please wait until your 6 week check up. It is happend already 3 times. Having sex just before period. Check here for alerts. I still have sex to this day. Or is it true at all, and when is tge best time to be intimate if planning for a baby? I had this happen to me before sometimes its from having rough sexor the sex makes your period come early.