Sore breast!!

Erin • Hello! The names, Erin. I`m very blessed that God has made me my amazing husband mike. We are now trying. Wish us luck!!
I've had very sore breast for the last two weeks. First started off with only the right breast and now the left hurts. It's mainly the nipples and they just won't go down. Plus my right nipple has been leaking clear/ white milky stuff. I'm not supposed to start my period till the 27th. Does anyone have an idea what's going on or what it could be??