With DD.. I was 8 months when I had the definite "yup, she's pregnant" belly.. I used to be a size 10-12 until then, but preferred baggier clothes.. However I didn't actually know I was pregnant until 7 months soooo....

DS, had a slight bump up the top at 13 weeks, noticeable by 18 weeks..

This time around.. Definately have got the bump and have since 11 weeks (could feel the hardness at the top at 8 weeks!) and I already feel as if my stomach is going to explode (like when you get REALLY bad gas)