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AF different by 5 days on different app

Amber • Mon, Aug 03 • 30 years old. We have one daughter, born on 2/10/14. TTC #2 since December 2014. Finally pregnant with #2 due 12/4/17!

AF on glow says due 8/7, and that I ovulated on 7/25. I had "peak" opk results on 7/24, 7/25 and 7/27.

Fertility Friend app changed my period to 8/12 and said I ovulated on 7/29. Which one should I believe?!?!

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