Hello,
My princess Chloe just had her puppies on New Years. I was so nervous and scared because it was her 1s liter.
Any how, she had 3 girls but need a c-section last minute.
So be prepared, google whelping box for yorkie and you get mostly everything you need.
One things for sure is they need to be in 85f. and it is still cold you will need to put a heating pad and towels over it to maintain them warm.
I have her in my room next to my bed inside her crate ( i have a flat bed) so i can monitor her through out the night. The puppies are 6 days today and God willing they continue to grow healthy. Also ask the vet. for more information and for calcium pills for her.
Hope this helps
& good luck