Hi, I m 20 years old and I m on birth control pills. My periods come on time all the time however this month I have experienced my period a week and a day early when they are due next Week. But it isn t red blood, it s a dark brown almost black discharge. I have missed taking some of the pills this month or have taken them late, but I have stopped taking the pills altogether until this discharge stops & it s become heavier.. My boyfriend and I have unprotected sex but he pulls out way before he needs to finish & finishes in a bunch of tissues or so. I feel like I have my periods as my cramps are exactly what I feel when on periods but they aren t due till next week. I have also taken a pregnancy test and it came out negative. What could be the cause of this?