Opk help? False pos?

So I’ve been using 3 different opks....I know, a little obsessive but oh well. I use the cheap strips, the digital clearblue advanced and the regular clearblue digital. The results have not been matching up at all.

Im taking femara so I’ve been using opks since day 10 per my dr.

I’ve had a flashing smiley on the advanced since cd 14...I’m now on cd 21.

The cheapie strips have all been negative

The regular clearblue advanced showed a solid smiley yesterday with first morning urine then a black circle around 2pm...blank circle around 7pm and a solid smiley around 11pm... and another blank circle this morning. I tested so much yesterday because I had a feeling it was a false positive because the clearblue advanced was negative and the strip was neg.

What’s going on? Has anyone ever had false pos on a digital?