After sex.

Ok so my boyfriend and I were having sex and everything is fine. It hurt a little bit but I figured that was just because it was per say the first real time. So after a while I just started bleeding....like kinda alot. So he stopped. I got cleaned up but now like a little over a week after I'm just feeling funny I'm having like a phantom period...cramps I feel bloated....idk what's going on. We used protection the entire time and he wasn't even close to finishing when we stopped...what's going on? Please help ladies.