As everyone is saying, it is a very good sign that your PSA is stable, even if it is 0.2. Also, like everyone is saying, a PSMA PET scan might not be sensitive enough to detect anything at this point. But there is one simple blood test you can take called the EpiSwitch PSE test that is 94% accurate on indicating the presence of prostate cancer in your body. See details here https://www.94percent.com/ Of course, close monitoring of your PSA is required no matter what and any further rise in PSA would trigger the need for a PSMA PET scan.