Heaven! I've been missing you!

Yep I have this too and did with dd. Mine passed after the first tri with dd. All your blood is going to your uterus, so if you are stationary the circulation isn't flowing as well itms, making you feel faint and requiring more oxygen...thus the breathlessness.

I fainted a few times with dd but not so far. Take it slow and keep some gentle movement into your day. It will improve when you blood volume increases in the second tri.