How much does/can a baby move at 21 weeks?

I’m 21 weeks today and I’ve been feeling a ton of “sensations” the entire day, like wayyy more than I would think possible? The feelings have been in 2 different spots right below my belly button and my underwear line. I’m not sure if it’s the baby or if I’m having some sort of weird muscle spasms? It’s very fluttery but in a very noticeable way. Just thought I’d get some thoughts, it’s my first so I’m lost at times lol