I need advice

For contents I’m 23F pregnant with my first child (my parent’s first grandchild). Mind you I’m not their only child I have an older brother and younger sister. So my mother is the type of person who would argue with a wooden fence and she’s been all about herself being a grandma ever since I told my family about my pregnancy. I didn’t have problems with my mother before becoming pregnant other than the occasional arguments. So one day I was on the phone with my Mother and we were talking about just random things and birth gets brought up because I’m pregnant of course, well get this (I haven’t asked her to be in MY delivery room nor do I want her in there) but she just expects she’s going to be in there like she’s entitled to it since I’m her daughter? I feel as if its expected because it’s going to be my first time giving birth, my mother has been stressing me out my entire pregnancy and having her in the delivery room is just going to cause more stress on my part. my bf and I are wanting it to be just the two of us. What should I say to my Mother without being too harsh about it?

Update: I told my mother how it’s just going to be my bf and I in the delivery room. She said she understood but I could tell she was visibility upset because of the way acted towards me afterwards. Then went on to say that we are two completely different people and how she’s not a private person and she thinks birth is a beautiful thing and that she wanted her mom in the room when she delivered her children because her mom is her right hand-man. I felt as if she was trying to guilt trip me into letting her into the room whenever I go to deliver. But I’m glad she knows now that I will not be letting her into the room until I’m ready for visitors