is this baby’s movement?

i’m 17 weeks 5 days and last night i experienced something i’ve never experienced except it wasn’t what i expected at all. it didn’t feel like a kick, it didn’t even feel like movement.

from a little bit underneath my belly button i felt bubbles. really really fast tiny bubbles. like when you’re a kid and you blow the straw into your chocolate milk. it felt like that but way tinier of bubbles. and it happened a lot before i fell back asleep.

is this just gas or is that the baby moving?