Me and my boyfriend are sexually active and the first time we had sex was 2 weeks ago while I was on my period. Now itâ€™s been two weeks and we had sex 2 days in a row and last night when he penetrated me and pulled out there was blood. I should be on my period but itâ€™s really weird. When we have sex I can feel it in my abdomen and itâ€™s sorta an uncomfortable feeling. So can sex cause my period or is there a reason Iâ€™m bleeding only during/ after sex? Weâ€™ve had it 3 times so it shouldnâ€™t be my cherry still bleeding.