Baby movement? Or am I just crazy?

I’m 16w4d and I’ve been feeling these little... I don’t know, bubbles? Inside my belly. I’ve also been noticing more of a need to burp throughout the day (although I’ve actually never been able to burp, I know it’s strange, don’t judge me 😝). But these bubbles are super weird and a little like pop rocks (if I can compare it to anything) and seem way higher than I would expect if it’s baby movement. I’ve also started showing way earlier than I thought I would, but I was pretty slim pre-baby and people tell me that’s not unusual. Since I’m a FTM I have NO idea what baby movement feels like, so putting it out there... thoughts?