Confused!?!

Nylah • TTC #1 with my husband❤️ We are now pregnant!!!! I`m so incredibly happy!!!
So my AF is due on January 9th but Glow is telling me to test tomorrow? Shouldn't I wait until the 9th or if I miss it? 
I'm very eager but I don't want to be disappointed by more BFNs. 😭 What should I do?