Bfn, but 4 days late


3 weeks ago I thought had plantation bleeding. Went to the doctor's office to get a blood pregnancy test. Since it can detect pregnancy before your late period. This was 6 days before my period and came back negative.

Well I'm on my 4th day being late. I have been having cramps everyday like I'm going to start, but nothing yet. Is it possible that I am pregnant or AF is just really late?