Another thing to add: pugs are often not the best mothers. They can struggle to remove the amniotic sac due to their flat faces, and also have a tendency to bite through the umbilical cord too close to the belly (again, flat face thing), which can injure or kill the pups. So be prepared to do both of those things for her if she has natural birth. And, as others have mentioned, many can't give natural birth, so must be put under for a c-section. Even after birth, many pugs want nothing to do with their puppies and must be coerced or even restrained every time the puppies need to feed. If she has become pregnant from this mating (which, yes, is possible), make sure you have lots of time set aside to be constantly managing the litter and making sure everyone is safe, warm, and fed. Because there's a good chance mama won't do it well herself.
Of course, some pugs do just fine mothering. But it's a known problem in the breed, and it's best to be prepared for the worst case scenario.
Of course, some pugs do just fine mothering. But it's a known problem in the breed, and it's best to be prepared for the worst case scenario.