I'm not due to get my period until March 29th... today (March 24th) I had heavy vaginal bleeding for about 15-20 minutes then it stopped! Now I have a dark brown (looks almost black) bloody discharge... I don't know what this means but its never happened to me before. I didn't have sex previous to this happening or the night before but me and my fiancé are trying to have a baby... could something be wrong?