Franci , a slow rise has got to be better than a fast one. I think you already know you can't take things for granted. A guy I knew thought he was in the clear more than 12 years after surgery and he wasn't being monitored. The next test he had lead to scans and found it had spread.
During my vaccine trial I had numerous bone and CT scans that found nothing, a few months later a PSMA scan found a hot spot, that was at 1.4 and you are a long way off from that.
Thanks Chris