So my period was 2 days late and started on Saturday and it usually goes 3 days max. The first two are super heavy and then the last day is light to spotting. I had two days of really heavy bleeding (normal red blood) and then it stopped. I had nothing on Monday, like my underwear were clean, everytime I wiped- nothing, clean. Yesterday I got this dark brown almost black blood and I have been having it since. I haven't needed a tampon again, but it's like a light flow (enough to fill a pantyliner every few hours). I have never had this before. I know your period gets darker towards the end but usually its like that for maybe 2 hours, not 2 full days. Any help as to what's going on?