What does baby first kicks feel like ?

This is my first time, I’m currently 21 weeks and I’m not sure if I started to feel my baby kick as yet. For a little while I felt like little bubble like feelings but only when I’m laying down for a while but over the past week I haven’t been feeling those little bubble like feelings I’m starting to feel something a bit a different and a little stronger, I do think it’s baby because I don’t usually feel those movements when I’m up and active or when I place my hand over my tummy.

So I just wanted a few persons to tell me what it felt/feels like for them and how do you know it’s baby ???