CT Scan miss some stones?

I went to the ER during the wee hours of this past Friday morning for labor - like pains that I suspected was a kidney stone passing. I had my first kidney stone a year ago that was large and it had to be treated with a lithotripsy, so this was my first experience with "passing" one. The nurses agreed it looked like I was passing a stone, but the doctor was not convinced. After my bloodwork came back with mildly elevated wbc and my urinalysis came back clean, he was ready to send me home with some pain meds and call it a day. I insisted on a CT scan because this was not ordinary pain. I didn't feel any relief until dilauded was administered. So I got my CT scan and sure enough, there are stones. I'm told two in my left kidney, both of them 3mm and should easily pass at home. I'm given a script for flomax, lortabs and ibuprofin and told to expect them to pass in the next 7 to 10 days. I go home at 5am and over the next 6 hours, I pass 4 stones that are each 3mm. I'm totally confused. Are these stones that were already in my bladder and not mentioned to me? Did the CT scan miss two of them? Do I still have two coming? Can a CT scan miss stones? I'm assuming the pain would become intense once the two in my kidney approached my bladder and that the four I passed were the ones that landed me in the ER. So maybe I had 6 of these things? Anyone else experience anything like this?

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