So I'm 18 weeks and I'm trying to figure out if I just felt the baby move or not. It felt like a…

So I'm 18 weeks and I'm trying to figure out if I just felt the baby move or not. It felt like a light muscle spasm in my lower abdomen right above my pants line. It happened a couple times in a row. Everything I've read said that the baby kicks will feel like popcorn or butterflies so I'm just wondering could that have been it? What did it feel like when you felt your baby kick the first time??