Baby movement!

Brittany • Mommy to a beautiful baby girl (7.6.16) and expecting our second in May!
I'll be 18 weeks on Saturday with my first baby and I've thought I've felt the baby move a few times, but I realize there is no pattern or regularity to it. I'm somewhat second guessing myself thinking it maybe gas or hunger. Is it normal to not have felt it OR not feel it very often?