Are you saying that she would be 8 weeks PG now? If so, and she's not showing or anything, then I'd say she may NOT be pregnant. At 8 weeks they would surely be showing and probably even seeing puppy movement. Maybe not so much if she's only having one puppy, but stil...????? I think I'd be taking her to the vet for another PG check. If she is 8 weeks along, she'd be due in one week!