Respond ASAP plz

Okay I wasn't sure what category to put this under but I had sex last week but he pulled out and I woke up at 3:30 am this morning to go pee and I had to pee so bad that when I was about to pee I had like the feeling I was going to orgasm but then it started stinging and I started peeing blood. I had sex Friday, started my period Saturday, (it's wed) but my period stopped yesterday help please !!