Mind you I puked anything up that wasn't carbs the first three months and went from kick boxing to couch surfing. Finally feeling better and the doctor suggested walking for exercise so I don't gain too much, I have a long way to go! Anyway it wasn't that hot, and we weren't going fast or far at all, but twice on my walk I got really dizzy, it felt like I almost fainted. Anyone experience this? I'm in my second trimester, I didn't think it was that common after the first? It was pretty scary, so I'm glad my husband was with me!