23 weeks & short of breath!

Madi
FTM! I'm only 23 weeks this week & am already slightly uncomfortable, mostly due to shortness of breath. I'm 5'1 and very petite with practically no torso, so I'm already very large. People keep asking when I'm due like it's any minute! I've gained 17 pounds (all in my belly, I've eating very healthy & working out daily). Baby is healthy & big already- almost a pound and a half already. I love my bump, but I'm really nervous about how the next 4 months are going to go since I'm already uncomfortable. Is anyone else expericing this? Particularly the shortness of breath? Thank you!