Hello. I am new to the Yorkie forum. Hello to all.

I have been trying to find a forum for a while now and just happened to run across this one while trying to find information on pregnancies and yorkies.
I think my little female may be pregnant... which worries me, because she is only ten and a half months old and weighs not quite four pounds. I am worried about her health, because of her size and age. This was definately an accident. I do have a male yorkie that I planned on breeding her to when she had her second or third cycle, but I had read that it was not healthy to breed the first time, so I'm very nervous. I did not see that she had gone into heat and then I went out of town and left them with my husband to care for and I believe that is when it may have happened. They are both healthy otherwise, AKC registered, beautiful lively dogs.
I'm just very a very paranoid and worried yorkie mother. Can anyone give me some signs to watch for? I noticed two days ago that her nipples seemed to be a little pinker and more prominent and her stomache seemed just a tiny bit bigger. (she is a very tiny dog.) I am going to try to take her to the vet on my day off next week. Does anyone know how much an ultrasound or a repro check would cost normally? I'm a newlywed and on a tight budget, but I'm not about to not go at the same time, I just want to be prepared.
Also, if she is pregnant, does anyone know what I should be feeding her? I have been feeding her Solid Gold Puppy up until now and had planned on switching her to Wysong or California Natural after a year. I have been trying to stick with the right amount of protein. I was advised against feeding a food with really high protein, as I was told it could lead to kidney problems over time in these small dogs. However, I thought if she is pregnant, I may be supposed to be feeding her more protein than I normally would? Is there Anything she should have more of or less of?
Well, enough of the 20 questions. Thanks for your time.
Bethany Dawn