This is a hormonal reaction at 22 weeks rather than milk. It really doesn't have much to do with breast feeding. It is common and even women who aren't pregnant can have this type of hormonal reaction believe it or not. But I wouldn't worry. You have a lot of hormones shifting and surging. LOL good luck
Yes very normal I did it with all of my pregnancies I'm currently 10 weeks pregnant now with my 5th. But yes it's normal no need to worry unless they start to leak like really really bad.