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OPK CLEARBLUE ADVANCED VS WONDFO

opk CLEARBLUE ADVANCED VS WONDFO" />

So I took a WONDFO opk it looked positive to me so I took a clearblue advanced opk that's supposed to show you, your 4 most fertile days. CLEARBLUE said negative 👎🏻. Which has me thinking why if the WONDFO looked positive to me then why wouldn't clear blue not even have a flashing smiley. I'm leaning towards the CLEARBLUE. Has this happened to anyone and what was the out come.

Which would you trust CLEARBLUE or WONDFO?

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