Different apps?

So i use two different apps for tracking my period/TTC. I use Glow(obviously) and Ovia. I put the same information into both - Glow says expected period is on Wednesday yet Ovia says today. They are usually in sync and spot on. Not sure why they switched around.. Which app should I go by? If I go by Ovia I am one day late. But if I go by glow I have two days until I would be considered late. Opinions on which one to go by ladies?? Thank you! Hopefully this is our month👶🍼