False Positives with Blue Dye

Help! Are blue dye false positives more likely when it's a vfl or can it also be false w a decent line? Took cheapie hpt and got a line w/in 1 1/2 mins (test results 2-10 mins). I don't want to get too excited bc this is my 🌈 and it's a blue dye test. Have taken bd tests before and never gotten a false positive. Also, tested bc (according to another app I am using along w Glow) I am 2 days late. According to Glow I am suppose to get AF today. Oh please, oh please be my positive!!