When does shortness of breathe become an issue?? *nothing to do with coronavirus*

BB

All day i feel like I’ve been struggling to catch my breathe and take a proper breathe , my bp is low but that’s normal for me , heart palpitations and irregular heartbeat (I’ve got a hospital grade BP machine)

I got these lots in the beginning but not the shortness of breathe so much

All my weight that I’ve gained this pregnancy is on my belly even though he’s small so I’m wondering if he’s just sitting high up or something?