Yep, 2 then the water broke, then 2 more?? Is that what happened? Eyes open at a week? This seems all just a little strange. I too in all my long years have never heard of that happening, guess stranger things have happen...
I also totally agree with all who have said Yorkie puppies should not be sold at 8 weeks if you honestly care about the puppies and their well being. The things their mother can give them and teach them is invaluable. I sincerely hope you reconsider.