is it possible to be pregnant even with BPN. AF was 2 days late and only had an unusually light flow for the 2 days, day 3 hardly anything and day 4 only when i visited the loo and wiped, the blood was brownish in colour. I have done two pregnancy test but both negative? Just wondered if perhaps this could be an implantation bleed as boobs are very big and very gassy. Desperately hoping it will turn positive.