
This is exactly the situation the breeder whose dog I used in the USA was faced with, and had an elective section on one of her bitches.
I had a very stressful whelping in May when using vets for cover when my vet was on call. Upshot was the covering vets would not give oxytocin until 4 hours after the first puppy.
Thsi in a bitch who ahd her first litter with no more than hour between pups, adn 2 hours between first two in second litter resulted in a stillbirth. My own vet would have listened to my expereince and her history.
The bitch lost 4 out of the 11 pups she was carrying and I had a job resucitating one of the survivors.