weight gain at 5 weeks

Posted by bumpnumber2

I'm skinny already but honestly feel like my belly is popped out and I'm only 5 weeks pregnant.  Could this be water weight?  I don't remember "seeing" anything with my first child.......but that was a while ago!!  I'm still going to the gym 3 times per week....feel like I'm eating the same.  The only difference is that I'm drinking a ton of water.  I'm soooo thirsty.  I remember that from last time......but I thought it came later on.  I read that the baby is 1 mm in size.......so why do I have a belly right away?  I'm about 107 lbs at 5'6" (last I checked). I need to re-weigh at the gym tomorrow! Thanks so much!