Baby in ribs?

What does it feel like when you’re baby is in your ribs? My baby isn’t breeched btw. I’ve noticed for a few weeks now (I’m 26 weeks) that I get a bubbly kind of feeling in my rib on the left side somewhat right under my boob.. it feels like bubbles or cracking. It only happens when I move a certain way or breathe in deeply & then when it happens I get a feeling like I have to burp like the Bubbles go up to my throat. I get lots of acid reflux too and I’m not sure if this is causing it. I’m just curious on what this could be?