Lung problems

Has anyone else ever felt like their chest is caving in on them? It doesn't matter if I'm sitting, standing, or laying down. I get spurts where I feel like my chest are caving in or that my lungs won't expand.
I'm 26 weeks, but I've been feeling this way for a while. I just keep forgetting to mention it at appointments. I know I'm well hydrated and I eat plenty, but I just hate this feeling. 😩
I figure it's just the fact that there's a baby and everything else there, but I still don't think it's normal.

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