
1. Can you see the puppies moving around?
2. Conception may not have taken place immediately so if you think she's 54 days from the first mating, she may not even be that far along, and for sure, the longer she can hold onto these puppies, the better.
3. If you can't trust your vet, go for a second opinion, or even switch. Has he actually examined your bitch?
4. I'd not be happy about seeing any bright red bleeding, beyond her normal season length. Most of mine, after being mated, just went through the days beyond the matings to around day 21 when it was all over, with minimal discharge, but I did have one who went into a more blood coloured discharge, not copious however, in her final week of season. At the time although she was fine, I'd decided she'd not taken. She had an uneventful pregnancy and 9 fabulous puppies.
Bottom line - if you are worried, and clearly you are, get her examined by a vet - another one if you can't trust the one you normally see.
ps I'm big on 'the apple won't drop until it's ripe' - but within reason (ie the bitch is otherwise fine) and not eating anything would be a concern ....... she may need small protein rich meals because she's stuffed with puppies however.