I felt like I noticed a difference in myself around 17-18 weeks, my friends and family began commenting around 20 weeks and by 22-23 weeks, it was noticeable. Seems like there is a sizable growth spurt coming your way, but it does depend a lot on your build.
Warning
No formatter is installed for the format bbhtml
I think I literally "popped" last night (I'm nearly 14 weeks). My husband even commented earlier today that I just have a bump very suddenly. I feel like it's really early, though. I know a lot of people say it doesn't matter, but I think height, torso length, etc, does. I'm short (5'2") and I have a very short torso. A lot of my tall, long-torsoed friends didn't show until 20 or so weeks.
Warning
No formatter is installed for the format bbhtml
Re: Bump
I kind of just feel fat, but I know that there is a bump there but under all of these winter clothes, it is hard to tell!
I am 21 weeks today!