Pain Near The Shoulder Blade Right Side. Hurts Worse When

Pain near the shoulder blade right side. Hurts worse when standing and doing activities such as meal prep. Discomfort in shoulder blades when sneezing. Pain simetimes feels like its in my chest on the right side. Been happening for a out a month. Im might want to mention i had a baby via c section 4 months a go and im breastfeeding.