Baby kicks??

Aly • Happily married. MC 4/2015👼🏻Baby girl 10/2016 💕 baby boy due 2/2018 💙
What do they feel like at first? 
I'm a first time mom, 16 weeks and 4 days. My doctor said most people feel them 18-22 weeks, but you could feel a lil something before then.  I've been getting like a twitch sensation below my belly button or a bubble sensation, and I've been thinking its just me. but it's happening more and more often I just can't help but wonder if it's our lil one? I guess I always thought the first kick would really feel like a kick, not a flutter lol.