[gemy]

Unless your vet is a specialist in reproduction, or a very experienced vet in breeding, I would be hesitant to wait. What does the necropsy say on the dead puppy? Did you test for Brucellosis prior to mating, both sire and dam need to be tested. And it truly doesn't matter if they have never been bred to your knowledge before, dogs can pick this STD up in other ways.

Brucellosis is one of the top causes for either early or late term mis-carriages.

At the minimum you need to know as precisely as possible all the "reasons" why you had a dead puppy at day 52.

I hope your female continues to do well, and you get some much needed answers.