Heartbeat on 3rd Trimester

Hello Mommies. I am currently on may 31 weeks po. Aside sa nkaka feel po ako ng movement and kicks ni baby sometimes meron rin pong weird feeling na mejo malakas na pulso sa puson ko po banda, mga seconds lng. Parang heartbeat na pulso. Heartbeat po ba kaya un ni baby? Sino po may same experience, what are your thoughts po? Salamat!