Sore breast/nipple PLEASE HELP

Jasmine
So my whole cycle was thrown off because I kept taking ovulation tests that were coming up negative during my fertile window and inputting the data. So I'm anywhere from one to five days past my fertile window and 10 Days till AF (so confusing.) 
Now that that's out of the way I'm really concerned as my left breast is incredibly sorr and my areola is larger as well as the breast itself. I'm not nauseous, no headaches, definitely fatigued maybe more so than lately but I've been going to the gym a lot lately. Could this be an early sign of pregnancy (seems way too early) or should I be concerned about my breast health. Please help