how do I tell my mom I'm having sex ?!!!!!

please help!! I'm 16 (almost 17) and me and my boyfriend have been dating for a year and 4 months. we've been having sex since April and my mom has recently been asking if I've been having sex and I told her no. she also made and appointment for me to get BC in decemberbecause she wants to prevent pregnancy. but i am so scared to tell her that ive been having sexbut I feel terrible for lying to her. someone please give me some advice !!!! please !!!!!

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