ok... so I had sex like on aug 20th. me and my boyfriend are very active and we have sex at least 3 times a day 4 days a week. but after we had 2 days after aug 20th I started to have a stinging sensation when I pee and when I wipe there is blood. I had my period already. I don't take birth control till next month. we have unprotected sex a lot.. PLEASE PLEASE help!!!