Kinda a personal cross-question..?
Answers: Dark colored blood is usually defined as old blood...this represents the contrary of the normal sloughing of the uterus commonly referred to as a womans 'period' (time of the month). With respect to your question, defining what it ability should be explained to you by a medical professional. I suggest you do make an appointment to be see by a gynecologist as soon as you can get contained by. Be sure to inform them of the bleeding time frame & specifics. You give little to no info, so elaborating is not appropriate here at this time. But please do see your GYN. Take care~
if u not long got on pills or the shot, etc. it could be your body adjust to it. it happened for me when i get on the shot. it lasted in the region of three months and there be also symptoms like severe dizziness, if you haven't lately got on bc, later see a doctor