Hello and thanks for researching this important question!
The average canine pregnancy lasts from 58-64 days.
You do have some time to go.
Begin taking this girl's temperature (rectally) three times daily from now on...her temperature will drop dramatically from 100-101F degrees to around 98-99F when she is 24 hours away from hard labor.
***Your veterinarian can take an xray of her abdomen. This will 100% confirm the pregnancy and will let you know how many puppies to expect...it is wise to have a vet's office aware of the impending births, in case you need on-the-spot assistance. Just as in people, many births go very quickly and very well, but some have serious problems that require medical help.***
Here is a link to an affordable and veterinary-school-quality book about canine reproduction and puppy care that many people find helpful to have on hand:
http://www.us.elsevierhealth.com/product.jsp?isbn=9781416031390
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