Sounds like it could be an umbilical hernia. I have one and it hurts if I do a lot of lifting or eating lol. Ask your Dr tho to make sure.
I am 28 weeks with #2 and had terrible belly button pain with both. Just the stretching of a growing bump. For me when i got bigger a maternity belt helped a lot. I feel your pain, literally ;) good luck
I have never heard of that. Might want to mention it to your doctor.