Glow told me I can test today!

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So glow told me I can test today but I don't know if I want too. Ugh. AF is due on Sunday so I'm trying to hang in there and hold off on testing until I officially miss AF. Help! What should I do?? With my daughter I tested on the day AF was suppose to come and I got a BFN. I tested again 4 days later and got my BFP. So I don't want the same thing to happen again. I am losing my mind!!!! How is everyone else's TTW going??