So I use 3 apps for fertility, Glow, Ovia and fertility friend. Glow has been off about my ovulation by only a couple days. Well this weekend I got Fertility friend and it says based on BBT and past periods I ovulated February 14th, where as Glow says February 22. For December and January FF was right on with when I experienced ovulation pain. Which app do I go by as far as when I ovulated and when I should test. I am experiencing a lot of symptoms currently