It's possible that was your bub.
I felt my first at 17 weeks. I didn't know anything about pregnancy & was only 17. One of mum's friends asked me one day if I'd felt her move yet. I didn't even know I would feel it. I thought it was just a baby & big belly! I didn't know they moved too!
That night I felt her.
I reckon it kinda feels like wind at the start.