please for the love of your own sanity DO NOT USE BLUE DYE! I have made this mistake on 2 separate occasions. I grabbed a test and didn't realize till I got home it was the stupid blue dye but I took them anyways and I always get the 2 pack. and both times on all 4 test I got a blue line that looked like a faint line not a squinter there was an obvious line. and both times they were false both times I'm assuming dye runs or evaps. and the line always showed in the time frame. I understand that it doesn't happen every time and some are actually positive BUT way to often I see the same false hope of the second line when using the blue dye. just save yourself the heartache and get the pink dye test. 💙 good luck and baby dust