Why are a the ovulation predictions different?!

Question

I don't know what to trust...haven't tried using opks yet but might have to if it keeps confusing me... 
​Glow says fertile period was 9/7-9/13 
​Ovia says 9/9-9/14
​MyDays says 9/4-9/9 (!)
​
​I don't know who to go by or even what they're basing that on!

Answer

I would definitely use an opk. I had the same issue, and only found the actual opk was accurate. I use this brand (link below) and they are sooo cheap! Hope this helps
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​ http://www.amazon.com/gp/aw/d/B005H7RDJC/188-6252674-0241663?vs=1

Answer

I felt the same way- the opk tests are the predictors. Go on amazon and get some for a good price. The other thing you can do is BD everyday and then you will meet all of the fertile windows :-); since we can't do that we Are going to BD as soon as I get a positive ok the opk for 4 days

Why are a the ovulation predictions different?!

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