my belly is pulsating😳😳😳😳

Char
Ok so I noticed this a few weeks back. Around 11-12w. I'm currently 16w4d. But right around my belly button I've noticed and can sometimes feel it pulsating. As in like a heart beat kind of way/rhythm. Is this normal? Or has anyone also had have this happen? This is my second child and even though my first was 4 years ago I can't seem to remember this with her..Â