Breast changes?

Tara • 26! TTC #2 for 6 months!
So my breasts have been sore ALL MONTH LONG, but now they are busting out of my bra, are super heavy and sore. Af is due in a few days, but this is different than normal. Has anyone ever had this kind of pregnancy symptom? I know they all kind of run together (Af symptoms and pregnancy symptoms!) Thanks guys!!