TMI maybe but serious question

Ok so me and my boyfriend just baby danced because AF is irregular so we’ve just decided to pretty much bd whenever, well he got really aggressive and all in bed which I didn’t mind at first but towards the end it started to kinda hurt. Well after everything ended, i felt cramps like AF cramps(bad ones) and really nauseous. Has anyone had that happen before? Also, I’m a day late from my AF.