Yes if your ECG, ECHO, TMT are normal then it is less likely to be a heart-related issue. Appears to be muscle - pull or musculoskeletal problem.
Next Steps
Take a week's course of painkiller+muscle relaxant prescription from a local physician.
Health Tips
Avoid lifting heavy weights & excess physical exertion.
Resume exercise only after pain relief.
If pain persists even after a week's course then revisit your physician for further evaluation.