
I'd imagine he won't do a C.Section unless she's started? As you don't know the mating date, this is a difficult one and as I've learnt being around here, toys do tend to whelp earlier than the 62 - 63 days I prefer to let mine get to. If mine go over by more than a couple of days, then I at least had my vet examine them. X-ray?
Some of mine would go into labour, but once feeling pain, stopped (secondary inertia) at which point if an oxytocin shot didn't get them going again, my vets would go for a Section. With my TOTAL agreement

There's also the possibility of there only being a small number of puppies, which can 'sit', needing a shot to get things moving, IF over the 62 - 63 days. Leaving them to 'sit' means they kept growing, making a Section more likely to be needed (big puppies).