Muscle spasm

Sarah
Hey all, I have had a really painful muscle spasm on the right side of my back for the last week or so. The pain is getting bad  and it has spread around to my ribs and feels like my back and ribs are bruised. Obviously I can't take muscle relaxers while pregnant. I've tried heat, ice, stretching, icy hot, rolling a golf ball over the muscle, and nothing is working!! Anyone have a stubborn muscle spasm they got rid of without meds??