Should I trust my Glow or my body

Dominique
My AF has always been regular and comes right on time. My last AF was the 6th of last month it always comes again around the same date the following month. But my Glow says it should be here today (2nd). Should I trust my body and how it's been for years or trust the app which will tell me my AF is late and mess with my true ovulation date. I'm so confused