
One of my girls would drag out the first stage from 7/8am to midnight but she wasn't stressed, I could see the waves of contractions along her sides between digging and shredding of paper, I'd give hourly nutrodrops and calciboost to keep levels up.
Are the pups due as some bitches have dry runs, provided she isn't stressed, passing dark green discharge or straining and getting no where I would hold off doing anything further, can you actually see the contractions.
If nothing doing by later this evening then speak to the vet