Ovulation day

Brandy

Ok so I use Glow & Premom apps. Glow is telling my that my ovulation day isn't untill Nov. 8 but Premom is saying it's today? I log my OPK in both apps, along with my BBT so idk how they could be so different. I've been test twice daily, once around 11:45 when I come home for lunch and then again about 18:00 when I get home. Premom is saying my OPK is positive & I'm at my peak but Glow is not saying that at all.