The first comments I started getting about pg #2 were not until 28 weeks. I had people not even notice I was pg at 34 weeks when I went to get my hair cut and eventually I brought up the subject. I remember noticing my belly had popped more around 14 weeks though. Maybe it just has to do with the clothes or way I walked. DD was up higher and I never really got the waddle like with DS and she was also pretty small when she was born and my belly went down in about 3 days. That was a very pleasant surprise after the 30 kilos I gained with DS and really had to work hard to lose. Now I'm pg again and not really showing a pg belly per se, though have definitely gained weight and my clothes seem tighter, which started at about 12 weeks. Maybe it's a boy again.