Rib/Upper back pain

RedDDD

I have been getting some pretty uncomfortable rib/back/shoulder pain on my right side where LO seems to be hanging out.  I had a massage last week and that seemed to help but its back with a vengence!  I apply a heating pad on it when I get home from work but that only really helps while I have the heat on.  When I am sitting at my desk it just gets worse and worse throughout the day.  Any suggestions? Im dying here and I have so much longer to go