I have been wondering the same thing. My tummy has just started to grow alot more in the past 2 weeks. At the moment I just feel as though I have stopped sucking my tummy in and i just look (and feel) really fat. I've never had a flat stomach and my boobs are big so I just look Iike I've eaten too much chocolate! I still haven't had any strangers say 'when are you due', when it happens I'll know then that I look preg and not just fat! I'll be very excited then!