So I am 16 days late on my period. Last week I took a couple of first response red dye tests the first one had a little bitty tiny line that I could only see when I held it up right at the light. The ones after that were negative. Today I took a first response digital test and it said positive (yes+). I haven't heard much about the digital tests and I would like to know how accurate they are. Are they known for giving false results for positive or negative?? HELP!!!