False positive on OPKs?

Question

Can you get a false positive on OPKs?
I'm using Clearblue Digital, and below are my tests. First is 2 days ago, second is yesterday, third and fourth are today. First 3 were taken at 2pm. The third (darkest) was today at 2pm and I got a smiley face. I took another one tonight (fourth) at 6pm and got a negative and the line is lighter.
Was today a false positive? Is that possible? Or did I somehow miss ovulation? 
We bd 4 days ago, 3 days ago, and 2 days ago. We missed yesterday due to circumstances out of our control (hospital visit). Am I out now?

Answer

None of those look positive to me 😣

Answer

It’s normal to have positives for a few days. The first positive is supposed to warn you that you’re about to ovulate. Then they come back down to negative after a couple days. It doesn’t mean they’re negative.

Answer

This shows my test progression. Yesterday afternoon was a positive. Yesterday evening was negative. This mid-morning was a positive. This afternoon was a negative.
...when am I ovulating, if I'm getting both positive and negative in the same day?!

Answer

Third test immediately after positive smiley face

Answer

Oh, and the line can get lighter and darker during that time.

False positive on OPKs?

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