Smaller, skinny woman tend to show a lot sooner. Everyone is different. But if you are expecting people to say 'I didn't know you were pregnant!' at 12wks, it's not gonna happen (unless you were carrying 20 babies)
I'm definitely big boned, and I finally 'popped' at 33wks. Before that I just looked a little more chubby. My 'pouch' just kinda smoothed over til then, lol.