Baby movement?

Tere
I'm 18 weeks pregnant. I was laying down, chillaxin, when I felt like a thick poke right under my belly button. I've felt slight flutters before, like tiny bubbles. But is this baby kicks or movement, or is he not strong enough yet for me to feel anything? My belly is forming and it's pretty firm but I want to make sure I'm not wrong and I'm also a FTM