I'm curvy also. I have very wide hips. By the time I was 23 weeks my co-workers were commenting on my bump. I'm 5'5" and I weigh 219 at 31 weeks and I've only gained 15 pounds with this pregnancy. Just as a reference.
Just depends on you and baby. I didn't show until about 18 weeks this time around. It was like it happened overnight too. I just woke up and he had decided he liked being right behind my belly button.
i didnt show until 24-26 weeks im 5'9