Hi There. I Had Sex With My Boyfriend Last Weekend.

Hi there. I had sex with my boyfriend last weekend. He was a little rough with me and the next day I started bleeding and have been bleeding for the last 5 days. I was not supposed to get my period until another 10 days. The bleeding looks like my period, but I want to be certain. Does this sound normal? Could the rough intercourse have caused my period to come early? Or does this sound like something else?