Period apps

Kayla

I usually use Flo for my period app. It says I am 16 days late(not shocking) and I started using Glow and it said I am over 25 days late. I have very irregular periods. I skip at least 3 months a year. My Flo app has finally gotten to where it’s correct. I took a PT about 4 days ago and it was negative. What should I do?