Which is correct???

Question

Hey girls. I just wanted to start out by saying this is my first month TTC. and my question is which of these calendars are correct or seem to be?. I'm trying to figure out what day I could have ovulated, or which calendar seems correct. And yes, I know I should have used ovulation tests but with this being our first month trying we happened to decide right in my window. (Well, one of my apps ovulation windows)
More detail.
I have 2 apps one I marked for my period and one on glow that I just downloaded. 
On my first app (My Days) It seems I supposedly ovulated earlier than my calender on Glow. My auto length for my period is about 38 days. So AF came on June 16th lasted 7 days. AF is suppost to make her way back July 24th. Which chart seems more accurate on my ovulation prediction?

Answer

Not sure, but I use two apps Glow and P tracker. Last month Glow was more accurate (at predicting my cycle start date) but the month before it was the other app. We are going to start TTC at the end of August, so I think I am going to gets some OPKs to see which app is more accurate at predicting ovulation. Right now there is about a week difference between the two apps. 
Good luck!

Which is correct???

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