I've been following this thread, agreeing with the reputable breeders. This dog should not have been bred in such ignorance! I get unbelievably angry at people who just want their dog to have puppies once, to cover the costs, to have a friend, whatever. Shame on the OP for letting this pregnancy happen. Sorry for being harsh. I feel for the dam and the puppies.
That being said, I have been spending a lot of time online, doing research about breeding yorkies. My mentor will entrust me with two of her females at the end of this year (I can't wait!!) and we will breed show yorkies. The reason I am saying this is that I came across a website that the OP will find incredibly helpful!
This is the most descriptive website about what can happen when your dog goes into whelp. It also has pictures to illustrate every story. Read this before your girl goes into whelp!
So you want to breed, I want to breed my Dog, Should I breed My Dog?