Boob leakage

Kiera • Married April 18th. Trying for second baby :)
Ok so I'm 23 weeks pregnant with baby #2. My boobs have been hurting and dry lately and I had heard that relieving some milk can help so I squeezed just a few drops out of eat Breast and now they are soooo sore! They aren't leaking anymore but my question is why the hell do they hurt so much and how do I make it stop? I didn't breastfeed with baby #1 but I plan to with #2