Possible external baby movement?

My mom put her hand on my lower abdomen today and thinks she could feel the baby (we were in the middle of some SERIOUS dancing or gymnastics). Is that possible? I’m 19 weeks in 15 minutes lol and have absolutely no fat except right below my belly button, and I’m not even showing a tiny bit yet. Just wondering!!!
You can even see the lump where the baby is currently, unless he or she is way down low and completely back.

I just want to make sure its possible and not her imagination, not that I'd tell her different!!!