hi, so i had unprotected sex on march 12. my cycles run in 28 days and my last cycle was feb 24, leaving me most fertile around march 7-9. he pulled out before cumming as well. i have been on BC for years and never miss a pill, only variance is potentially an hour to hour and a half late. my period usually comes the last wednesday of every month, meaning it would be here march 23. on march 14-march 16 i started having a brownish mucusy discharge like old period. on march 17, i started having bright red blood coming out, with like strings of tissue/clots coming out through saturday, march 19. most of sunday it kind of stopped and i took a pregnancy test that day (8 days post sex) and it was negative. it picked back up more on monday night into tuesday and wednesday, still being red. i've been feeling cramps for the past two weeks and even still today it kind of feels pulsing but when i put my hands on my lower abdomen i don't feel anything. it doesn't sound as though i'm pregnant right? i'm not sure if all my stress from the thought of being pregnant and exams brought my period on early and then died down when i relaxed from the sight of clotting/red blood. what is going on??