@jeffmarc has covered the bases pretty much, John. Your PSA does show movement, so it’s not one of those that don’t produce much PSA - it might have been 3X that value 6 months from now, right?
What you and your docs will watch on your 3 month PSA’s is movement and velocity. If, after 6 or 9 months, or 2 years or whatever, your PSA’s consistently rise (and by how much) you’ll KNOW that your cancer is back and growing.
Hopefully that will not happen and you will enjoy many years cancer free. Best,
Phil