Hi, Fred.
As you know, mate, I'm not medically trained. However, I think it's fair to say, that any rise, no matter how small, is not ideal.
Having said that, this may just be a blip. One single rise is inconclusive, hopefully this won't be a trend and your PSA will stabilise or even fall to what it was before.
You're still a very long way from 0.2 which is usually deemed as recurrence and could trigger further treatment.
Good luck. 👍