Can a 5 mm lower pole kidney stone go away without me knowing?

Found out in Jan 2025 that I have a 5 mm lower pole kidney stone through an ultrasound but now repeat testing in April 2026 says “no renal calculi” but scan visibility is also “satisfactory” which I guess means ok but not great. Might I add this time the tech didn’t make me lay to my sides to check it from all angles, I think they may have missed checking it from all different angles because they only did the flat position check.

A 5 mm stone is pretty big , this is my first stone but reading all the stories here people have pain passing even a 1mm stone that is impossible right my 5 mm stone just vanished into thin air or passed without me knowing?

Also lower pole stones are the hardest to pass from what I read because they are working against gravity so that makes it even more impossible. I still have flutters/painless spasms in kidney area so likely the stone is there irritating my kidneys, even on the right side that never showed any stones.

And I have been checking my urine regularly and haven’t seen any stone being passed or felt anything.