Does anyone have sex on their period regularly? I am on the BC pill TriSprintec. My boyfriend and I have sex regularly including while i'm on my cycle. Due to the birth control pill my periods went from lasting 7 days to 4-5 days. This cycle however, my boyfriend and I had sex on the day I should have ended my cycle, however today starts the 11th day straight that I have been bleeding. Has anyone else had this problem of a prolonged period l? Is it due to the sex? Is it from my birth control? I am slightly concerned due to the fact that this has gone on 6-7 days longer than it should have