3 day AF

So I normally have a 7 day AF, heavy for the first 3 and it tapers off from there. May was my first month off BC and I knew AF would be about a week late. Sure enough 6 days past normal time she came and was heavy, a bit heavier than normal but I figured whatever my body is getting back to pre BC. Well it just all of a sudden stopped yesterday! No tapering! After 3 days! Not sure about that. Anyone else had that happen? I did take a test while I was late and it was bfn.