My OH was also <0.03 post op. They were really pleased with his result and it has remained undectable since... they have just signed him off 3 monthly psa tests and it will now be 6 monthly and the surgeon doesn't want to talk to him for 12 months.
As long as it comes back undetectable, you will fine.
Some hospitals don't give results down to how many zeros you have, knowing anxious men can fixate or anxious wives like me :)
They just say it's undetectable, it's fine, see you in 3 months. Some men like their results in detail, some are happy with the word undetectable...and that is the magic word. And Its what you've got.
When you have your post op consultation, just throw the magic word into the conversation and he will reassure you.