I have had this brown boogry odorless substance coming out of me for a week and a half now. Ive been on birth control for years and my periods are always normal and Im not due for my period for another month and a few days. (I am on the 3 month BC). I was on antibiotics 2 weeks before this issue occured. Everything I look up it says something about the beginning of pregnancy? Could it be anything else?