I think I’m feeling him move?

Da

While just relaxing and almost falling asleep yesterday I noticed this feeling of “air bubbles” moving and then “popping” right in the area my little guy is in. 17.5weeks and this is my second pregnancy but first to ever make it this far so I’m not sure if that’s what it is. I felt it again late last night. Pretty sure it’s him but was wondering what it feels like at this stage. Thanks!