
It's happened twice with my girls, the first time back in the summer, sadly my girl lost her litter at 7 weeks when the vet took her off the AB's............but another of my girls had a slight infection in the second week after mating, got her on AB's and she was fine, went on to have 6 beautiful babies.
I think as long as you catch it early enough, you should be fine! It's surprising how many bitches do get slight infections after matings.