how can you not show when ur pregnant?

when i get pregnant , i don't want my stomache to show at all , is there a way i won't show ? can i do sit-ups ? Or eat less so i won't be huge? sorry this may sound stupid but it grosses me out when i see pregnant stomached in person .., it looks painful and gross .. i'm kinda skinny i'm 29 . i just don't want to show at all , i know it's possible because this girl named Sarah stage didn't even show at allll and i want to know secrets !!!!!