Any other short mamas?

Ka
Im 4'11'' and i just feel so uncomfortable, like there is no more room for him to keep growing! :( my upper abdomin gets hard then releases But not lower? But its not even comfortable to sit, like my rib cage is digging into something(s) when i sit :( most comfortable laying down but eventually my upper to mid back starts to hurt. Just cant win! Lol  28weeks.. Welcome to third trimester! Hahah