Im 17 years old and recently had sex. It was my second time ever having sex. The first time was fine. This time, however, I have been bleeding dark red blood ever since it happened (last night) and im having lower abdominal pain, almost like cramps. The guy I had sex with was very big and the sex hurt quite a bit. Do I need to go to a doctor and get checked out? Or is it just the normal tearing of the hymen, which must have just not happened the 1st time?