Confusing OPKs

Bryanna • Future Teacher👩🏾‍🏫 Four-Paw Mom🐶🐱

Yesterday I had a positive OPK but today I tested at the same time but it’s negative. I would like to mention we did to the deed last night and all through yesterday I was cramping and felt lots of pressure as if I was on my period.

Why are OPKs so confusing 😭😭

Basically my question is why did I have a positive yesterday but negative today? 🤷🏾‍♀️🤦🏾‍♀️