I have sharp moderate pain in upper right chest and back when i breath. just had ekg heart was fine?

Chest pain: May be gallbladder or constochondritis ( inflammation of rib muscle wall) but may also may be a clot in your lungs ,because of the concern for clot, especially if a family history of on birth control pills and smoker, go to ER urgetn care today

See below: If it hurts only with a very deep breath, and also hurts stretching to either side with right arm extended above your head, or with twisting at the waist it's likely muscle strain or a pinched nerve. If it hurts with even shallow breathing, and not with the above exercise, viral pleurisy is likely. **However to make a definite diagnosis you need to see your physician and be examined. *See comments