
It is a bit early on but anything out of the ordinary, especially with the bitch being restless, you do need to consider eclampsia. Or, as it IS so early on -a dead pup that hasn't been passed yet. I'd expect panting but not pacing, most bitches won't leave their pups for the first few days even to drink, eat or toilet and have to be persuaded to go outside.
If she was mine I'd see the vet today, not tomorrow, to play safe.