18w & seeing baby movement from outside?!


So im just 18 weeks today and i was laying down and started feeling little kicks!! I cant even explain it other then it felt like a baby was moving around in there. Kind of felt like gas without actually having any gas. And then i started watching my stomach and every time there was a movement there was obvious movement from the outside. It looked like i was getting poked from the inside. This is so weird its my first baby and i thought you couldnt see movement from the outside until way later. Is this the baby??? This is my first pregnancy