Hello everyone! i am new on here and my Yorkie is expecting for the first time. She is 7 years old and this was an accident. She breed with a chihuahua smaller than her. My husband and I just recently split up and she is now in an environment with no fenced in yard, and well you know how dogs are!

She snuck out of the house while I went out on porch for 3 seconds. Anyway.....today is her 62nd day and all she is doing is sleeping. She will not eat her puppy food anymore but will eat anything else I let her have. She has ate today. I have always heard that small breeds usually have their litter early. I am just really concerned. I love my yorkie so much and don't want to see anything go wrong with her. I have taken her to the vet 3 different times already and she has a litter of 4 coming! With it being her 62nd day today, when should I expect her to start whelping? She has shown no signs of nesting and just really has been sleeping all day today.
should I be concerned or just wait wait wait? Any advice would be wonderful!