Take a deep breath. Enjoy the baby being a baby, but do realize that when you take them to potty that you may have to wait a really looooooooooooong time. I've sat for ages and waited for babies to potty. I train mine to go outside in the daytime and on pads in the garage at night and in inclimate weather. I never dared to take them back in until they had gone, because I knew what would happen.
Anyway, patience is the key and I should also tell you that at 11 weeks there aren't probably too many out there that go where they're supposed to go. It would be considered a miracle if they did. Your baby isn't stubborn. Your baby is just being what it is and that is a baby. Take a deep breath and forget yelling. You will just cause a yorkie to do just the opposite of what you want them to do if you yell at them and they won't form the bond with you that you are wanting, because they will learn to fear you. Most yorkies are very sensitive, too. Take care.