I'm 15 weeks and a FTM, also im underweight. From last month to this month I've only gain half a pound. I'm worried my baby will be very much effected by this issue. The doctor said I have to gain 4 pounds every week, is there anything I can do to gain weight? Also I have a very high metabolism, in anyway is that effecting my weight gain? However, is it also normal that I'm not getting hungry a lot either? I try to eat, but I get full really fast so I try to eat as much as I possibly can. So if anyone can help me i would be so grateful!