Ovulation dates

Erin

I've been using My Calendar for at least 4 years (to track my periods) well now that I'm TTC I've been using Glow as well, here's my dilemma the fertile phases for each app are way different which makes it hard when you're TTC!!!

How do I determine which app to follow ( I have a basal thermometer and ovulation test, haven't started temping because I feel I don't know when to temp, and ovulation test can get pricy to test the days using both apps)