It's interesting, I don't remember when I quite started to show with my first, but looking back at pictures I had a noticeable little bump at 18 weeks. Then my second pregnancy I miscarried at 9 weeks, but it was crazy because I was already starting to have an expanding belly even that early. This time is technically my 3rd pregnancy, but only my 2nd one that got to this point. I've had almost no noticeable change in my belly until this past week and then I suddenly look like I did at 20 weeks with my first!