Hi Welcome to Yorkie Talk and to the wonderful world of owning yorkies! I'll say some prayers that Miracle has a safe whelp of healthy puppies. From the dates you've given and her low temps, I wouldn't be surprised if you have puppies before the weekend is up.
With no pre-natal vet visits I guess you have no idea how many pups there are. Did I see that she's had other litters before? Do you know how many pups she had with them? Does her belly look very big? Maybe you could post a picture of her belly for us. You've gotten lots of help from good breeders here; they will surely help you when Miracle's whelping time arrives. Good luck to you!
