Hi. I have recently had sex for the second time and I'm a little worried as to what to think. It was rough so I'm hoping that's the reason why it has been bleeding. The blood is a small amount and it either comes out bright red or dark brown. It seems to be coming from the outside of my vagina because when I put a tampon in, only the string had blood on it.. In the vaginal opening, a small part of my hymen turned a black color and that's were the blood seems to be coming from... I'm not sure what to do and I'm scared something really bad happened.