It could be coccidea and it's good that there is no blood in it. However, parvo can't be ruled out without a vet and your pup is open to it now since she hasn't finished her puppy vaccines.
I'd personally err on the side of caution and go to the ER. Any diarrhea in a Yorkie pup and be dehydrating and cause extreme problems. At the least, please call them.
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