Sometimes after I have sex with my boyfriend I get cramps, they feel like period cramps. It's been a long time since I had sex with anyone other than him, so I don't remember if I felt this before. We don't have rough sex, he isn't too big and the sex doesn't last that long, so I don't know what could be causing this. My period isn't supposed to come for two weeks either. Does anyone else get this and is it normal?