If you've only got 2 1/2 more weeks then you need to get her to a vet and have an X-ray around day 49 to see how many (if any) pups there are and see if she has a wide enough pelvis to pass the pups. You need to get your self prepared financially to possibly have to pay for an emergency c-section or risk losing both your dog and the pups. You need to find someone who can help you deliver the pups safely and correctly or make arrangements to have her stay with your vet so she can be watched like a hawk for complications.
Time is not on your side to get prepared at this point. This thread was just posted today and is an example of what can happen. It's why breeding is best left those who have studied and prepared and have a great in-person mentor.
http://www.yorkietalk.com/forums/sic...ath-birth.html