It's your fault that the bitch is pregnant! There's no accidental pregnancy here. You were taught the birds and the bees weren't you? Ill make it simple for you!

Entire male + uneutered female = puppies (and not necessarily healthy ones either!)

Take her to a new vet! One that knows what they're talking about!

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Bonnie 29.01.97 - 21.09.11
Millie 01.02.01
Seamus 09.07.00
Tyler 08.11.00
Kiki 15.10.10
Chico 01.07.11
Riley & Louie 16.02.11
Holly & Ivy - 11.11.11

Tell me about it - my girls generally wouldn't know aggression if it smacked them in the face - they would even by-pass / slink away from dogs outside trying to mount them - but woe-betide them if one of the resident dogs tried outside season time (in fact, I get more problems with my girls mounting each other) needless to say, they don't even try - once bitten, twice shy - boy oh boy do they learn quickly

And even as novices, if introduced to an in season bitch who isn't ready for mating, they just walk away

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What you need to know before buying a Labrador puppy

Actually there are exceptions. My sheltie bitch was impossible to tell even a day before her first litter. I was working for a vet at the time so I can assure you they had a thorough look (before the days of scanning) and though my gut feeling was that she was in pup it was not until she went into labour that I could be absolutely sure. She had 2 fairly large puppies with no problems.

The OP's situation does sound most odd though. There is so much preparation for a litter, and particularly important with a breed known for whelping problems, that I would definitely want to know for sure not that scanning is easily available. Surely a scan cant be wrong at this late stage can it. Or could a single pup get missed, not sure.

a friend of mine has had something like this happen, are you sure your girl is pregnant? my friend took her chi to the stud dog, had sucsessfull tie, at about 7 weeks along the bitch tied with friends dog, she took her to vets and the vet said she must have missed on first mating with arranged stud dog and had a silent season 7 weeks along, the tie with the dog at 7 weeks did produce a litter so i would say get your vet to scan her, if shes not in whelp to first mating you can get the missmate jab done to prevent pups from this tie x