Trouble catching my breath

Jasmine

I’m 31 weeks baby is head down and everything. I’m just having the hardest time catching my breath. It feels like I have to take the deepest breaths in order to fill my lungs. Idk what’s going on but I’m scared tho. This is the first time this has happened during this pregnancy. Feels like my upper I side organs are just tired!!! What could be going on