Be very carefull when using the blue dye tests. I got 2 positives in the same day. They looked a lot like yours, maybe even a little darker, but they where false. I tested with a frer the next day and nothing!! I also had an ept have a dark blue, very skinny line and it was also negative. I didn't find that out till after I told everyone I was pregnant, then my period started right on time. I personally would recommend only using pink dye test since the blue is famous for giving false hope. Hope I am wrong and this is your bfp!!!!!!