i have been sexually active for about 2 years now with only one partner. he has had sex with one other person, but did so with a condom. we have been regularly having sex for a few months now and have used a condom until recently because i started birth control a little over a month ago. about a week ago i let him "finish" inside me. about two days later when i went to the bathroom to pee i noticed a smell that i have never smelled before. it was pretty awful, unlike anything before. just once i experienced discolored discharge that was slightly brown. sometimes i notice the smell and other times i dont, and the only time i notice it is after peeing. does anyone know what this could be? i am pretty worried and i'm only seventeen. any information would be greatly appreciated. thank you