Hello everyone! I am about 21 weeks along in my 3rd pregnancy, but posting on a website is new to me :). I am about 30 pounds lighter starting this pregnancy than I was with my other two. Now, I am not a marathon runner by any means, but in decent shape. However, over the last couple of weeks I am finding that I am short of breath doing the simplest things. Also, my heart will start beating fast and hard really easy. Anyone else having this, or should I be worried? Thanks for any suggestions!!!