When I wake up in the morning my stomach is on the
smaller side, and by the end of the day I swear
my tummy stretches out a lot (making it feel harder and fuller - by the end of the day, I definitely "look" pregnant). Now this sounds kind of gross, but in all honesty I think that as you eat throughout the day it gives your tummy that fuller feeling.. and you'll notice it more if you're on the thin side. Obviously it's not all food in there...