has he/she fallen? Do you know what the cause could be? I would still call the Vet and run the scenario by him and see what he says. Better to err in the favor of safety than to be sorry later on. Good luck and plenty of xoxoxo to your baby.
Thanks to Maui and to (sorry don't have in hand here) was it Hello06? both of you for concern about our kitty. He is actually an old fellow. Will keep an eye on him and get back.