I'm 13 weeks with my first DC and feeling worse than I ever have in the pregnancy. I'm so tired, hot and weak that the hour train commute and short walk to work a couple of times a week is too much for me. I threw up in the work kitchen and came over all faint so they sent me home in a taxi and told me not to come back until I feel stronger 
Please tell me this gets better soon?! I feel like I was mostly getting on with life in the first trimester but I only feel ok now if I'm lying down at home, doing nothing and often not even then either. I feel so guilty about work. On the bright side, the baby is doing just fine!