I know how fragile my little 8 month old girl is and how she's still developing each day, so I can't imagine what a pregnancy would be like for pups so young as 8-9 months.
Whether it be some of Yorkietalk's experts (who have known and bred Yorkies for quite some time) or a trusted vet with knowledge of the breed, please seek the counsel of someone who will advise you with your dog's best interest in mind. As much as you might love any surviving puppies from an ill-advised pregnancy, your female's health should come first. There will be other pups to love--love the one you have with all you have and protect her.
Best of luck to you and to her.
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