Gynecologist 911!!!

Samantha
Okay so I am 16 and me and my boyfriend whom love eachother very much and have started being sexually active. But yesterday my mom scheduled my first gynecologist appointment. She does not know I am having sex and I really do not want her to know at all. What happens if while she is at the appointment with me and the doctor asks me if im sexually active! I do not want to lie to my doctor but I also really dont my mother to find out im having sex. What do I do??