Left chest pain. No mucus formations.

Good morning sir / madam, I am Experiencing some kind of little pain when I move left hand towards right, or suddenly if I stood up, or while laying on floor towards left side ( during sleep). When I am doing yoga or exercise, am not getting any during the process. But after finishing the daily exercise, I am facing again. I am in dilemma whether it is gastric issue/ acidity or heart issues. Due to this work from home conditions, I gained weight. This pain am facing since 2 and half weeks. When I am taking breath heavily no pain. Kindly suggest me the way forward. I have attached few pics where I am facing problem. Pain is not radiating any where. When I try to press the location where am facing pain, there is no discomfort. No motions, no throat pain, no fever, no cough. No mucus formations.