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Who is "this guy" that told you that? If he isn't a vet, then don't worry about him. For real. Just make sure you get your little lady to a vet and have the vet ensure everything is ok along the way. "Mutts" are not bad...as a matter of fact, some of the smartest dogs I've had were "mutts." Sure, I would never recommend breeding a mix on purpose, but what's done is done. Just keep her healthy and vet checked...and remember, we are here for support and help.
There are many VERY KNOWLEDGEABLE breeders on this forum so if you ever have a problem or question during this, head on down to the Breeders section of the forum and ask away. They will help you so much..and there is a LOT to learn and be ready for in helping a yorkie give birth (I believe it's called whelping..am I right anyone?) I'm trying to learn the terminology of things