I am glad you are in contact with your vet and your breeder.
It is possible that the pups were dropping and getting in position. It could still be a couple of day. You cannot rely on just the low temperature. Just make sure you watch her closely and don't leave her alone for very long. Once the pups start coming I recommend you be right there to help break the sack and cut the cord otherwise you risk the momma accidentally hurting the pup.
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"Lord grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference." |