I'm 21 weeks and gaining weight like crazy. I've already gained 17 lbs in 11 weeks.  Anyone else struggling?  I'm actually doing better than my last pregnancy but my doctor already told me I need to start watching my food intake and need to start walking (which I have neglected my gym time).  It is just so frustrating when I'm around people that are pregnant, don't workout, eat whatever they want, and barley gain weight. Where does my metabolism go when I'm pregnant.