why is there such a big difference between apps?

Question

Why does glow say my fertile time is 2 days after my period ends (the 9th), But another popular app I use is telling me my fertile time is on the 14th? Why the huge difference?

Answer

I use both glow and ovia for tracking and they are almost identical. Ovia is like 2 days earlier on my period but that's because I haven't entered enough data on there. Next cycle it will get more accurate

Answer

Order some OPKs off amazon and track it yourself for at least two months and then you'll know !

Answer

Thanks for the advice. I had ordered some maybe 3 years ago and put it into the other app, but I just started using this app bc as you can see, the other one isn't getting me pregnant! Lol.

Answer

Cause the more data you enter the better it will be at predicting

why is there such a big difference between apps?

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