Conflicting apps??

Maurah

I use Ovia and and glow and they are usually spot on with each other last month my period was 30 days late. Now I don’t know which one to use. Guess I may have to track for a few months and get a base line again. One says my period is 2 days late the other one says my period is in 9 day idk what to think or believe 🤷🏻‍♀️