Opk and Glow's predictions

Michelle
This was my first month using an opk (Clearblue Advanced Digital). I started tracking my temp about 10 months ago, so I had a relatively good idea of when to start test with the opk, or so I thought. I used my 10th test stick today. 
​I finally got a flashing smiley today, and it's my third fertile day according to Glow.
My question is if others have had an accurate prediction from Glow? Can I rely on Glow's prediction next month to start testing? 

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