Your PSA is too low for a PSMA PET scan to be useful, It won’t find anything. Your PSA should be at least .5 before you consider A PET scan, though a doctor may go a little lower.

A .02 PET scan is really undetectable and not an issue you should worry about yet.

I had surgery 3 1/2 years later my PSA started rising. I had salvage radiation. 2 1/2 years later my PSA started rising above .2, At that point, they put me on Lupron (ADT). You are not even close to that so you really need to wait for future tests to show if you really have a PSA increase.