I've come to the conclusion it's men and women who've never had babies who say you can't feel anything that early. Cause I've had gas for 32 years. I've been pregnant twice. I can certainly tell the difference, and I'm willing to bet nearly all women are the same!
(PS: Felt mine the first time about 14 weeks, and yes, I've had *visible* kicks from around 19 weeks. And I hate people who assume the momma is lying. We know, darnit!)