You are fine, as treatment won't restart/start until PSA reaches a much higher level.
For the first two years I was being tested where undetectable was <0.1 ,
then I asked for a greater sensitivity and I immediately saw my PSA hovering just below 0.1 at 0.08.
Made my life more stressful.
No new treatment, just watch the ball bounce incessantly.
My first test had a floor limit of <.1. My URO was happy with that. I went to a lab that had a floor of <.05. First result was .05. 6 months later .08. In my case, I want to see if there is a rising trend so I can think about
treatment if it rises above .1