To help you understand our perspective a little better, in most states in the USA, it is against the law for a puppy to be sold before 8 weeks. That is how important it is. Bigger dogs might be fine going home at 8 weeks but yorkies have their own special needs. We are talking about a very small breed and they are very fragile and susceptible to problems as young puppies. Many people here have had problems bringing their puppy home at 8 weeks. It's really better to just play it safe. Good luck on your grades and welcome to YT!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226