The belly touching

I don't know if y'all mind it but I really don't like people touching my belly 😔 it makes me super uncomfortable. It feels intimate and they don't even ask first. I know it's meant with good intentions but how do I stop people from doing it? Twice now I've opened my coat and a hand has landed on me, rubbing me. Idk why but it makes me want to cry or get angry. Why does nobody ask? The first time I opened my coat and my cousin just rubbed my tummy. The second time my mother in law asked to see the bump so I unzipped my jacket and she landed on me. Do most women like this?