Anyone else wake up feeling not pregnant?

Katie
When I wake up in the morning my belly is so small I don't feel pregnant some days! But by the time I go to bed, I feel huge! Like a whale! Lol this is my second baby, so I know they say you show faster, but I'm not feeling too big at 15 weeks. (I started showing with my son around 20 weeks) I've only gained 3lbs, which I think at this stage is pretty normal.