Hi. Last night, I ha protected sex. When it was over, my partner went to the bathroom and when he came out he asked me if I was ok because I bled alot. It was not my first time having sex and I was not in any pain. There was no blood on the sheets. When I went to the bathroom I urinated. No pain, no blood in my urine. But when I wiped , there were faint traces of blood on the paper. I went back to the bedroom and my partner as if I was sure that I was ok because there were chunks of blood. What could have caused this?