It started around 8-9 weeks I think. The top stuck out and the bottom was still in, then it gradually all came out. Third pregnancy and I have a weird navel... And I blew up really early.
Ridiculously early with this pregnancy. Which is my 5th but 3rd baby. Anyway around 17-18 weeks! It's been pooped out ever since but now at 35 weeks it looks like its starting to go flat.