my crazy period... sos

So I’ve been taking birth control, “the pill”, on and off for a year now and I don’t know if it’s the stress of college move in day or the constant fear that I won’t be able to get into medical school but my period has been going strong for the past three weeks. My periods are usually 4-5 days, decently heavy with minimal cramps and so was this one but past that I’ve been having dark brown discharge. And I just don’t know what to do!!