I'm the mistress of self-delusion so convinced myself that I wasn't very big at all. I have since seen photos of myself and I was MASSIVE tummy-wise but had only put on 6kg. DD was 8lb 10oz and my ob was spot on (just from a feel, no scan).

Oh, and what really peed me off was that everyone (including me) thought I was having a boy. It was only a couple of people with the really whacky theories who thought I was having a girl. And yeah, the whackos were right!