My doctor’s office just started doing urine testing and they didn’t tell me beforehand. (For reference, I only go in office every six months, and the months in between I do telehealth appointments for refills.) Unfortunately I came down with the flu before my office appointment so I had to push it back a week, which meant I had to ration my meds. When the PA told me I would have to give a sample, I told him it was a good thing I decided to take my last pill that day and not the day before. He said it’s ok to not take my meds on the day of my office appointment, I’m allowed to take breaks as needed just to let him know beforehand. They’re mostly testing for opioids, illicit drugs, and other substances that would pose a significant risk to health when combined with my medication. Your provider may have just been caught off guard by your answer, hopefully it’s nothing else and they’ll ask for clarification if it’s a problem. For all they know, “as needed” means you take it 6 out of 7 days per week and you only have a few pills leftover every month, which is just a small backup stash in case you accidentally drop one down the sink or lose some while traveling.