PSA six weeks after radical prostatectomy

My PSA was 7.75 and MRI showed prostate lesion with extension into left nerve bundle, no other areas affected. I decided to have radical prostatectomy. Gleason score was 4+3=7 with minor tertiary gleason pattern 5. Pathology came back clear of additional spread to surrounding tissue. At my six week follow up my PSA was 9.9 and my urologist stated he had never witnessed in over a thousand cases a PSA being higher six weeks after surgery and ordered another test. One week later it was 10.3. He and the oncologist said they had never seen this before. I am now being scheduled for a PSMA Pet scan. Has anyone experienced a similar outcome or seen a similar case?