Coworkers - Mini Vent

I didn't tell my boss until 13 weeks and I'm glad I waited. I don't feel bad for admiting I don't want any feedback about my pregnancy. I don't want to be asked how I'm doing, or the sex/name of the baby etc etc. I work in a huge office and I'm dreading the day the whole office knows. I just don't care, I want to just go to work and come home.  Why is pregnancy so public? I need tips to keep people out my business without ruining work relationships. I will probably cringe if anyone touches my belly 😕