Boyfriends Sister.

My boyfriend and I live with his sister and her man. We live in a two bedroom apartment. I recently found out I am pregnant. We just told her that we are expecting, she is very excited. I think she is more excited than I am. Well, she took me to ONE of my appointments due to my boyfriend having to work. She had gotten even more excited about her brother having a baby. She was like, “I’m coming to the next appointment”. I really don’t want her coming, although I wanted her to at first. After that appointment and the talk after the appointment makes me want this experience just my man and I. This is our first baby and I want to go how WE want it. I don’t know how to explain this to her. We also told her she can name the girl because it was the heat of the moment and now I’m regretting that.

I need advice ,PLEASE!