It all depends on the number of children you have.I am on my 5th and I started to show month 2.So the more you have the sooner you will show!!!

Hya I'm quite petite and naturally slim. Only 8 - 10 weeks and me n the daddy have both agreed that I'm starting to get a little tummy going on =]] However I know a girl who's around 5 months who's a little bit bigger than ave. and she's not showing at all. I'm not sure whether your normal shape affects it though because another girl I know is fifteen weeks and no signs at all, she's still as slim as ever the lucky thing. I'm looking forward to being "pleasantly plump" as my luverly supportive better half likes to say. Apparently I'm going to look like Juno tehehe...x.x.x.x.