As said above the change in psa over time is a good measure. Although, rarely, some men don't get much increase in their psa.
The symptoms could be other things and many men have an operation to widen their urethra as the prostate has expanded to block it.
I had symptoms of urgency but that is also a symptom of an overactive bladder for which your brain needs retraining.
So having another psa test in a few months will be a useful step. Once you start on the prostate cancer treadmill you can find it hard to get off as there are so many ambiguous symptoms. It takes several different sorts of tests to be certain and even then it might not be 100% certain of what is the best course, for example: watch and wait, active surveillance, biopsy etc.
As also said above a DRE might give an indication although at 3.2 it might not. You'd think a GP would do that as a matter of course if you've had a blood test.
All the best, Peter