Sore breasts for the first time in my life?

Angela • Married my best friend 3/16/18 rainbow baby 🌈 born 6/16/18

So I have four more days before I get my period. I tested two days ago and tests were negative. I now have extremely sore bbs and white lotion cm which is all very weird for me. I keep hoping that I'm prego but chances are I'm probably not.