Different Apps Different Fertile Days??

Michelle
So ot of curiously I downloaded two other fertility apps to give more insight while TTC. After back entering some data all 3 apps showed different times for when I am most fertile. Well of course that has done nothing but confuse me. 
With my cycle starting July 18 one has my fertile window over, one is on the decline (yesterday being my most fertile day) and this app saying Monday! They are all over the place! 
Just wondering if anyone has experienced this and real data on what day (if you know) you actually conceived.

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