What's going on

Katie • Army wife. Mother of two. Ttc wanting baby number 3.
I know this sounds weird but according to glow I don't start my period for 12 more days.  But my boobs are so sore. Like I can't even wear a bra without being extremely uncomfortable.  I have been craving nutty bars so bad I have been dreaming band waking up wanting them. I took a pregnancy and it was negitive.  Is it too early to tell  What is wrong with me