It depends on the person, I hardly showed at all until I was about 16/17 weeks. However when I got there I blew up! Lol most people start showing more in the second trimester because thats when you start gaining weight! You waist however is expanding now but it may be more noticable than you think!
Btw when I read your post I though you said you were 11 y/o and I freaked! Lol I was like omg shes must be scared! Then I re-read it!
how old are you anyway??
Good luck and best wishes
-jessika-