Glow says 9/13

Gaabriellahh • 27... Baby number 4.. Lilybeau
I'm a mommy of 3. My oldest 2 kids are from a pervious relationship (boy and girl) and my youngest son I share with my bf of 4+yrs. My bf and I are TTC with high hopes for a little girl. I'm just getting off the IUD and trying glow. Glow says AF is due 9/13 but I have a short cycle 24-26 days. So I'm thinking if I do get AF it might come around 9/5ish. Idk sucks cuz we're really hoping n TTC. We're a really sexual active couple and have sex at least once a day.. At least!