Hi!
I had yorkies back in the mid 90's when my daughter was born. They were a little "curious" at first when we brought her home, but they warmed up to her really fast and became her best friends in no time. They never tried to harm her in any way, but let me warn you....they did steal her baby toys quite a bit, LOL! When she would be in her bouncy seat on the floor, they would take the toys she would drop and run for the hills! I had to be very careful where I would sit her bottles as well. But other than that, everything went really good with a new baby and yorkies in the same house. (Once in a while they'd bark at something and wake her up, but that just goes along with having dogs...they wake ME up to this day, ha ha!
Good luck with your pregnancy and best wishes,