hey everyone! i'm new here and fairly new to the hobby. i was planning on lurking the whole time but i'm just completely lost with this one.

i noticed a spot on my BPs stomach was pulsating irregularly. first thing that came to my mind was the chestburster from aliens, but thats besides the point. i starting thinking that it was the heart but i'm almost positive that i wouldn't be able to see it that clearly even if it was beating as hard as it could. what could it be? should i be concerned about it?

heres the video: