Parent's insurance

So I'm 25, and I'm on my parent's insurance. They don't know I'm sexually active and they'd kill me if they knew. I went to my obgyn today and got tested for stds and got a prescription for birth control. So my question is, will my mom (since she's the principal insurer) receive info about what exactly happened or what I got prescribed for? I went to my account (for the insurance) and it said that my info is private on their health record online since I'm over 18 but will it say something on the bill?