Am I feeling my own pulse?!!

Lately (the last week or so) I have randomly been feeling what I think is my pulse low in my belly??

I am 28w4d and my baby is super active...initially I thought I was feeling her kick that is how strong this is! It feels exactly the same as her thuds when she kicks but it is perfectly rhythmic...which made me skeptical.

It will come and go lasting a few minutes to maybe 5/10 minutes at a time and then it goes away. As far as I know I do not have an anterior placenta (unless that can change during pregnancy?)

Anyone else have this? Or know what it is? I am just hoping it’s normal!