How Long Does Heat Last for the Yorkie?
Heat can last from 2 to 4 weeks. Each cycle may be different. For example, your Yorkie's first heat may last 2 weeks and her next one may last 4.
I also found this for you.
Dog in heat. What to expect when your dog comes in heat
I read that on some website... Not sure if it is true. I would just buy the diapers if it were me, until you are able to get her spayed.