Dr said to go to ER

I have been having a lot of trouble breathing, can't lay down or slouch at all. I get dizzy walking up a few steps and my hands are kind of tingly if I do too much. Called my dr, expexted her to say it's normal but instead she told me to go to the ER! Now I'm all freaked out that my baby hasn't been getting enough oxygen.

Update: Went to urgent care. No immediate concern from vitals but they are sending me to L&D to monitor me and baby. I really didn't think this was that big of a deal :0 JK, they won't take me at L&D don't know why, so I ended up in the ER anyway.