Innie or Outie

Currently week 32 going week 33 Pregnant. Gender has been revealed as Baby Girl during week 20. However, when I was at the end of the 2nd trimester to the 3rd trimester, my belly button became an Outie and popped out instead. Then my family then kept doubting the baby gender. Does the belly button really tell the gender of the baby? I have bought all the baby stuff and I'm confused now. #firsttimemom