wanting another child. but is it right to prepare the first child

[jessymum]

I am 37 years old, I have been in a new relationship for about three years with a wonderful man, with cohabitation since last summer.
i have a first-born son who has just turned 18, and i wish to have another child with my partner.

My son has a very good relationship with his stepfather, they share many interests, sports, but he is very jealous and attached to me.
question --- is it right to sound him out, to prepare him for the possibility of the birth of a little brother...
or to announce the news a few months after the pregnancy?
Many of my friends are against the preparation, they consider it a useless anxiety.Maybe I won't get pregnant.

TAhen sometimes we go to bed in the afternoon and I don't want her to think about intercourse.
A big hug and congratulations on the forum