Some say that 0.03 is the lowest level to exclude most natural fluctuations. Many hospitals use much higher levels up to 0.1,
If it was at a GP they sometimes do miss off the < sign and I'd query about the original lab report. It happened to me at the one test I had the GP.
I think I'd be wanting a 2nd psa test although on the other hand it's pretty low and if it came up as <0.03 it could leave doubts in your mind whether it's 0.29. So you might want a 3rd test and so on.
I also think that if I had another test, even if in 3 months, I'd be on my very best behaviour in the weeks before. No alcohol, no stimulations, no excessive activity. Hoping that might have the very small effect to get it back under.
It is pretty low at 0.03 but I'd be wanting to know more in the hope it was a temporary blip or bad reading. So I'd perhaps wait a few weeks and ask for another test to see if it's moved. Not that it's likely to do any good as they don't usually do anything till it reaches 0.1 and keeps rising. All the best.