please check your calendar carefully and determine the date on which she was bred. You can use the calculator on
www.debbiejensen.com to determine her whelp date and also Start Reading Up. Yorkies are not a 'let nature take it's course' breed to whelp. Most need quite a bit of hands on help and many, especially small ones need c-section to deliver. You will need to have an x-ray done about a week prior to her due date to get measurements on her pelvic capacity and the size of the pups to determine if free whelping is even a possibility or if a c-section should be scheduled.