I tested last week and got a BFN but then I realized I had the date AF was due off. I thought I was due to start on the 11th but it was really the 13th or 14th. I tested again today with a blue dye test because that was all my neighborhood store had, and at first seemed a BFN too but past the 2min mark but before the 10 was a up a very light blue line appeared. I am thinking its an evap but its enough to make me wonder!! kwim???