Help !! When should I take a pregnancy test

I have two apps I use to keep up with my menstrual & ovulation!! 
Glow tells me one thing & my other app tells me different .!! 
When Do Y'all Think I Should Test 
 Last period was August 9th & my ovulation dates are totally different glow has different date from other app .. An my next Af is different also dating ! 😩 plz help me