25 weeks and having trouble breathing sometimes

Last week I was 24 weeks and right before bed my chest started hurting and tightening really bad like right in between my breast!! And I told my husband it was hard for me to breathe and I had a lot of pain. He said it may just be gas don't worry about try and relax and go to sleep!! But I couldn't the pain was something I never felt before and I needed relief and fast. I stretched, walked, was on my hands and knees nothing! Helped then it just stopped!! But since then it has happened a couple more times same symptoms it hurts to breathe chest is tight and now the pain is still in between my breast and under them!! Mainly on the right side like is the baby causes this by the way he's moving or do you think I should be worried bcuz just as fast as it comes it goes away!! Does this happen to anyone else