What Causes Pain In Breast Radiating Towards Armpit After An Injury?

I HAVE BROKEN RIGHT COLLARBONE MORE THAN THREE WEEKS PASSED OVER THE ACCIDENT, I STILL HAVE PAIN IN MY RIGHT BREAST TO MY ARMPIT I WONDER IF THIS IS NORMAL? DOES LESSER THE PAIN MEANS FRACTURED PIECES START BONDING AGAIN? CAN I TAKE OFF MY SLING WHILE LYING ? THANKS