Breathless?

Erika • 💙5.12.15, expecting #2 💙 12.7.18
I'm 12 weeks tomorrow and I swear I sometimes have to catch my breath from talking too much. Like, I know walking up stairs or exercise should make me out of breath but I literally have to catch my breath after walking 50 feet sometimes. I'm a little chubby but I have only gained 1 pound during my first trimester so I don't think it's from that lol anyone else about 12 weeks & having this issue?