Is it a hernia does anyone know?

im 380 pounds and i do alot of heavy lifting and push objects at work between 200 and 300 pounds and a guy at work had hernias so i pressed down on my upper part of stomach and went down a bit and i felt a small bump almost like a small marble but sometimes it feels smaller i made an doctor appointment in a couple days ut just wondering if it could be a hernia or somethng else and how serious it could be