I just really don't remember being this big this early last time!
I know it's normal to 'show' a bit earlier the second time and I am pretty sure my abdominal muscles are indeed rubbish, as I haven't done much proper exercise since DS was born 2 years ago. :)
I think I am just paranoid as I am also extremely hungry and feel like I eat so much. I am worried I am eating my way to a giant baby and/or giant me! 
It does actually look and feel like a bump, not like it's entirely made out of snacks and I can feel baby jumping about in there quite a lot.
Am I the only one who is worried about becoming a whale by the time DC2 is due next April.... 