> but he said the puppies will definetley die as they're only 8 weeks old

Glad that's not my vet! I am worried that your vet doesn't know that toy pups are perfectly viable at 8 weeks.
My vet actually EXPECTS to deliver live pups from a C-section. Thank god.
I haven't had such a dischage, so am only advising what I would do with my toys.
If, as you say, she is not weeping out, and she is perfectly fine in herself, then just watch her closely. Yes, if she looks ill or seems to be far too quiet, I would want an x-ray or scan to help me decide on the way forward. But then, I would be discussing with my vet what my options are, and would be telling him what my decision is. I am concerned that, if your vet thinks that whelps are not viable, that no effort will be made. At my surgery, it is the veterinary nurses responsibility to get the pups going while the vet sees to the bitch.
Do you not have a better vet localy?