My favorite dog breeding, whelping, and weaning website:
Canine Reproduction Video and Book on Breeding and Whelping dogs by Debbie Jensen for dog breeders and Whelping Supplies needed to deliver puppies.
You will find tons of helpful information from the many links on either side on this webpage.
You do count 63 days from the first "tie". Keep in mind that this is an aprroximate due date and can vary, give or take a few days. But if you think her due date is February 12, I am hoping that she does not have the pups anytime soon. I'm afraid having them this early the pups would be born premature & may have problems. If your female was truely having contractions, I would definitely take her to your vet & have her checked and have an xray done to determine how many pups & their sizes in comparison to the birth canal.
Good luck to you; I'll send some prayers you way. Please keep us posted.