Bleeding but shouldn’t have a period

Okay so the last time I got my period was about almost two weeks ago, and for the past two days I’ve been having really dark blood, basically brown come out along with killer cramps. The cramps are the same as any other period but I should not be bleeding during this time, as I was looking for a reason for this I’ve come across that it could be from birth control which I’m on, endometriosis, or pregnancy there were a couple more but I don’t feel like those matched properly to my symptoms, I really doubt that I’m pregnant but I also have never had this before so i don’t know, if any of you have had these problems please let me know how you eased them and fixed it, thank you