you are really entitled to confidentiality when it comes to sexual matters so i know how awkward it is having your mother in the room when this question was asked. you can always call the doctor back (in private) to reveal confidential information. this is an important question to assess your pregnancy or std risks but the answer really will not influence the type of birth control pills that are prescribed. they will work. if you take them properly. and you can have extra protection for pregnancy and std prevention if you insist that your partner use a condom always.
when you go to get on the pill and they ask if you've had sex or not would it matter what your answer was. if i went to the doctors and they asked me if i had sex or not. and i did and i said i didn't because i don't want my mom to know would it affect my birth control? would it still work? because all they check for if you did have sex was if you were pregnant or if you have a std or hiv.