I need advice!!

So I’m 17 and am sexually active, I use birth control and condoms for protection. My mom doesn’t know I have sex but she does know I’m on birth control. The birth control is mainly to keep my estrogen count high because I have more testosterone in my body naturally. So it’s nearing the end of my prescription and I have to go back to the obgyn to get another three months prescribed. I am dreading my mom going because she wants to come in the room. Now you can see why I don’t want her to come in because I don’t want her to find out. I’m also not dating this boy. Basically everytime I ask to go in by myself she starts yelling at me and saying no because she thinks I don’t know what to ask my doctor. I need advice to either get her to not go in with me or on how to persuade her to come in at the end so she can ask questions. Help please 💕💕