hi im a 19 yr old girl and am in a relationship 5 yrs with my bf, we have an active sexual lifestyle but im not on any birth control, we use protection most of the time, i am always on time with my period, exactly 28 days later? i wasnt due them for another 2 weeks when i started 2 notice a brown discharge, this never happend to me before, i was gettin little cramps indicating my period, then 3 days after the dischrge i was drunk and had unprotected sex, the next dat the brown discharge turned a pinky color then turned into blood its not really heavy nor light i done a pregnancy test but came out negative? i cannot go to my doctor as i am in the process of changing doctors im really stressed plz help xxx