Would my doctors tell my parents that i'm sexually active?

So i have a doctor's visit tomorrow and i want to see if my doctor will refer me to an obgyn to be put on birth control. I went with my sister yesterday and she told the doctor she was sexually active but shes 18 and she's allowed to do whatever she wants. Unfortunately i'm not a legal adult yet so my parents loom over everything I do. I want to know if my doctor will tell my parents because I don't want them finding out.