When is it "normal" to start showing a belly?

Gabriela • Expecting Baby #3!
This is my 3rd pregnancy, I've read that the more babies you have the sooner you start showing. I have a belly but I think it's more of a muffin top! lol! I've gained about 3lbs and I'm 8 weeks pregnant. I want to know when it would be appropriate for me to just let it hang out and look pregnant?!