What does your vet say? If there are only two, schedule a C-Section in concert with your vet. Only two can be too large to be born naturally and they may not produce enough hormones for adequate contractions to be born.
3 spines and there may be a hidden 4th puppy with that bad side only angle. Is it MRI or Xray? Why was the dam not laid on her back? Techs are rarely off in litter size by more than one. What did the tech and vet say? . Also do they have more than one sheet?
Regardless of number, that one pup looks AWFULLY LARGE compared to the dam (is that a weiner dog?) and I would want a C Sect for my lovely.