So my boyfriend and I were having sex and he pulled out and we stood up and embraced eachother (like we always do) and I felt something drip down my leg, which I felt like (and thought) I was just extremely wet. When we went to 'go at it' again, he noticed that there was blood on my leg and we noticed it was on his hand, the condom, the floor and on my inner thighs. We've had sex before and this hasn't happened. I start my period next week but the bleeding stopped that night... What do you think happened?