I had my period finished like 5 days ago, and right after my period finished I had anal with my bf, but few semen drop near my vagina hole ,but we immediately,cleaned n washes it, but I still got sacred so I took 4 birth control pills, then at night I felt sick n vomited pink so I stopped taking it. And now it has been five days, ,and suddenly something black /dark brown stretchy thing came out from my vagina, whats that