I suspect she's having a false pregnancy. If she were pregnant, you should be able to tell, even if she's having a small litter. At this stage, you could have your vet do an x-ray to see if she's pregnant, and how many puppies are in there.
Virtually all female dogs experience some degree of false pregnancy, including mammary development, nesting behavior, even false labor and adopting a surrogate puppy...a toy, for example. I've even heard of a Dachshund who adopted the telephone as her puppy!
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