Ovulation calendar— help!

I’m currently trying to get pregnant and I use the glow app and other apps for period tracking, etc... I prefer glow, but there are discrepancies in the dates that I’m ovulating Between all the apps.. the other apps are all different in time. They vary in time as to when I’m ovulating and the range is anywhere from 1-2 weeks after my period ends!!!! I’m confused now... when the hell am I ovulating and when should I try to conceive?! Ughhh... what do you ladies think is right?!