Short of breath

I'm 17 weeks today, and I've noticed the last few days (maybe even the last week) that I've been very short of breath. I can't seem to catch my breath. I'm always taking very deep breaths and it helps for a minute and then I'm back to feeling short of breath again. Anyone else having this issue? My next doctor apt is Thursday so I'm going to mention it to her, I'm just curious about other mommys to be.