Difficult breathing

Hi sana may sumagot! Actually nagsearch na ko and it says its normal naman sa buntis na nasa 3rd trimester na ang mahirapan huminga. But mine is getting worst, especially pag nakahiga na ako. Kahit na elevated na yung unan ko, ganun parin. Ask ko lang, do I need to be worried? And ask my oby about my situatuion? Thanks a lot sa sasagot. 😞