I did read online last night that its a medical mystery as to why women in the 1st tri suffer from shortness of breath, but what I'd like to know is that I'm not alone in this??? Every so often thru out the day I get nausea accompanied by what feels like shortness of breath, it's as tho I need to keep breathing in deep and if I lay down I just feel as though Im going to be sick, which is now totally putting me off eating... My body temp is up too, no fever or anything- and it's making me absolutely exhausted. Since its been 3 years since I was last in the first tri, I cant remember how normal this actually is. Like I said, I read online that its pretty common but nobody really knows why it occurs so early in some women when the baby is still the size of a pea. Usually it happens when the uterus starts pushing upwards.