Is this normal?

Hi, 30 weeks and 3 days and sometimes when I feel the baby kick it’s a consistent pattern. As if a ball is bouncing in there and I can feel it with my hand over and over and over. Almost like a heart beat but slower..

It’s not a kick -in the way that it happens and then happens in a diff spot, and it’s not movement—-this is in the same spot that lasts a few minutes.

I this normal?