Difficulty breathing

Hi all, since 19 weeks into my pregnancy i will have difficulty breathing esp at night. I will wake up because of this and been sleeping propped up on pillows so its difficult to slp on my left or right side. Sometimes im so worried i might stop breathing since its so difficult!. Is this normal? Cant think of ways to prevent this other than continue to slp like this and hope it dont harm my baby.#pregnancy #firstbaby