Please i am confused! Ff vs Fertility monitor?

Sugar plum
First time i used opk's and i need a little help here. So today FF made a cross hair on CD15?cos of the rise i had on CD16 and followed by an other 2 high temps, but  I got my +opk s on CD16 and i think even a darker one 
 n CD17. (Got a peak with a CB advanced digital on CD16 too.) and it was yesterday that i felt ovulation pain and yesterday morning was my last EWCM. In the pm i was already dry.which one you think it makes more sense? Thanks. 

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