I'm a 16 year old female. I hadn't had sex in a long time but yesterday I did. My partner was rough with me during the sex and it did sort of hurt during and after. We used protection also. A while after we had sex i noticed i was bleeding. The bleeding didn't last long. Only about 15 minutes, but i freaked out because it had never happened to me before and i never heard of that happening to anyone. Im just wondering why it happened and if it's serious enough that I have to go to the doctor and get it checked out.