out of breath

So I know it's pretty normal to have short breath especially in your third trimester, but I'm 28 weeks almost 29, but holy crap I get so short of breath. Like even sitting doing nothing I sometimes have short breath. And at work I get up and walk to the back and I'm out of breath. I feel like this is a little excessive to be this out of breath. And I'm not overweight or anything I'm about 130. Is this normal or should I talk to my doctor about it?