Hm. Not really sure, Sunnydelite. Belly button pain is common, as the uterus grows and pushes against it, but you say the pain is below that. Possibly a stretching pain? Or could it be the abdominal muscles separating, creating the diastasis recti? Just a thought.
My belly button is semi-out at this point. It's also very sensitive. I bumped it against the shopping cart handle the other day and just about jumped through the roof. It hurt!!!
Sandra