
6 years ago we lost a litter very similar circumstances, my bitch was scanned at 5 weeks, we clearly saw 8+ pups, she started bleeding so I feared the worst, she was scanned twice weekly right up to day 51 when my vet confirmed the litter had 'gone' day 56 she delivered 2 mummified dead pups but no sign of the other 6. 2 WEEKS later she passed another two, but that was it. She was put on a course of very strong AB's, it was never suggested opening her up though to clean her out, 2 years after she went on to have a healthy litter of 8 again, with no problems. She has now been spayed.
I did actually take pictures of the mummified pups, they looked like miniature pups curled up in the foetal position, but very black, about the size of a golf ball.
It took her about 2 weeks before she stopped mourning her pups, we just tried to get her back to her normal routine, removing any soft toys etc that would remind her of her babies, lots of extra walks once she recovered.