Baby bumps!

Michelle • Married and first time mommy!
This post is not to offend anyone and if it does, I apologize in advance. 
I must be bigger than I think I am or something because I am 19 weeks and I can't see a baby bump. I see girls on here at 20 weeks or 21 weeks  that are bigger than me with such beautiful, notciable baby bumps. I'm just so jealous because I want a cute baby bump! :( 
And I think to myself there shouldn't be such a big belly bump difference from 19 weeks and 20/21 weeks.