a little nervous, anyone experience this?

Maleah • 21 year old Mama of a beautiful girl. She will be two in Dec 2018. Currently hoping on baby number 2!
I'm 34 weeks and Since last night I have found it very hard and more difficult to breath. Like sometimes I have to gasp for air. Also my pulse is consistently between 108-117. I'm really hot and keep sweating. I did call my dr and I'm going in in a little over an hour. I just wanted to know if any of you ladies have experienced this??? I also take iron supplements as I was mildly anemic but I take the iron now so it shouldn't be that? Help!