Verified answer

Having a dark brown/black menstrual discharge is not unusual. Menstrual blood may be red, pink or brown. It sounds like your period started early.

Hope this is helpful, Your BEINGgirl Experts

Yes, it's oxidized endometrial fluid. Being on birth control often makes shedding of the endometrium very slow and sluggish. Nothing to worry about. It will turn red as it starts shedding faster.

It is old blood.