Princess started peeing on the floor again after her spay but it was determined that she most likely had an accident or two from being on the pain meds and out of it, then when she felt better was confused about where she was supposed to go again, especially since she could smell the prior spots.
Be sure to use an enzyme cleaner & according to Nature's Miracle (widely recommended) you have to
soak all the way through the pad into the floorboards for it to be effective...which can take 2-3 weeks to dry, & wont "work" until it is dry. (Just trying to save you the headache & waste of time & money I incurred).
Hope the vet can rule anything else out and she's feeling better soon!