Why do I have pain..feels like internal belly button

Morgan

30 weeks tomorrow, ftm.

I have been trying to describe the pain to my mom. My description is..

"I think she's trying to eat through my belly button" or "that she is tugging on the umbilical cord" which leads me to worrying that she's tangled.

My placenta is located in the front, behind my belly button..

Anyone have any ideas?