Ok so I was on BC for about 10 years and have been off it for about 5 months. About a month ago I took 2 blue dye tests when I was 2 wks late, and I got a faint line-it was clearly there. The next was was there but very faint. So I waited a few days, took a pink dye test and nothing then on TOP of that, aunt flow came the next day... I just don't know how reliable they are in looking for ANY input , thanks ladies!!