An update for those in a similar situation looking at this thread in the future:
A vet visit 2 weeks after this was posted revealed there was no 4th kitten; what I'd felt was most likely the blood engorged uterus. No explanation for the movement I'd felt, but it was subtle so could have been...
Ok. Mother delivered 2 kittens initially, about 2 hours apart, Fri Sept 5th. Thought she was done, but about 7 hours later, on the 6th, the birth pain screams were heard again, delivered a 3rd, live. Thought she was done then, but a gentle exam (lightly feeling around her abdomen) revealed at...
