Has anyone experienced your baby pulling the umbilical cord?

I've noticed in the past couple of weeks in my 3rd trimester that my belly button "sunk" back in even though it's been popped since my 2nd trimester. When I tell my husband about it and point out the sunken belly button, we see it slowly being pushed back out 😂 kinda seems like my baby is playing with the umbilical cord? Now that I'm in week 33, she's been doing this more often so that I can feel her tugging my belly button and pushing it back out. Has anyone else experienced this? #firstmom #firsttimemom