Mine started showing right below my belly button 4inches below then really quick i was showing high. So you will be showing your belly 4 in below your belly button but around 3 or 4 months. Many girls are different some start showing really low others really high.
it would be above your pubic line more so as it will show above your pelvis... i started showing myself up really high above my belly button as everything gets pushed up(not that baby is even close to there) i am also bigger so i dont know i would notice lower down until i got really noticeable
I hope this makes sense? lol