Is she having any contractions at all?
Without being there, very hard to advise. It does sound like she is in pre-labor. If this started last night and there are no contractions, I would be concerned. Can you feel any pups moving? You have a rectal thermometer you can check her temp with? I would expect something in 24 hours. Like I saud, hard to advise. You know your dog. Weekend or not, she may need to go to the Vet to be checked.
Glad you took her in! Hard to lose a pup but you could have lost her too from infection. As soon as she us better, I would seriously consider spaying her.