Can you pass a kidney stone without knowing it?

Yes: Small stones may pass with no symptoms whatsoever.

Yes u can. : Pain from kidney stones usually occurs as the stone passes through the narrow ureter (tube between kidney and bladder). Once it drops into the bladder there is not much pain. Because the urethra (tube from the bladder to the outside) is larger than the ureters the stone is usually passed easily and without much notice.