I think people should mind their own business and keep their opinions to themselves.

I got huge amounts of drama from my ILs because I refused to tell them DD2's sex. Nobody but my mum and my lovely belly buddy friends knew I had found out DD1's sex so that was ok, but they all knew that I found out DD2's sex but I refused to tell any of them until she was born. My DH hadn't wanted to find out, so I refused to tell anyone else the sex of our baby until my DH knew first, which meant after her birth. They were furious.

I'd just be telling them all to sod off. Your baby. Your choice. Sadly though it seems that from the second your pregnancy is known, everything has an opinion on everything and so many people seem to be offended when you don't take their advice.