I was on BC for a few years and my bf and I have been TTC for 3 months now. My last three cycles have been exactly 33 days. AF isn't due until February 15 (CD28). Tonight we were having sex and afterwards there was brown blood, a small amount but noticeable on him and when I wiped. I have mild cramping but nothing like my period, and that usually happens before I start bleeding. Could it be implantation bleeding? Or just AF visiting 6 days too early.