Hi Vic,
6mm is indeed tiny. My tumor was exactly 3 times larger. I had RARP back in August and am currently undetectable.
I wish you the best of luck with your biopsy results. But if they do come back positive, at least know that it's been caught very early and you should do well with treatment.
One post biopsy side effect you should be aware of is that you likely will have a lot of blood in your semen for a few weeks. For me, my semen looked like pure blood. It was freaky looking, but is apparently normal and despite the way it looked, there wasn't any pain. Just an FYI...