well this in a few ways sound semi similar to how my first time went a month ago, i dunno how old you are but i am 17. My mom would have probably said the same thing to me but ive been on BC for a few years now for ovarian cysts so i cant tell you from expirence how to handle that situation but i can try and help you. First of all just know that going to your mother about this sort of thing is going to be scary for her as well as you, no matter how leaniant or cool she may be, having your teenage daughter come up to you and tell you shes thinking about becoming sexually active is a big slap in the face sometimes (im just telling you what my mom told me lol) What i would suggest doing is make sure shes in a good mood first of all and sit down with her and say something along the lines of "mom..you told me i could come to you when i felt i was ready to be on the pill, and i think im ready now, (insert boyfriends name here) and i have talked about having sex but we arent sure if we are going to do it right now, but to be on the safe side i would like to start the birth control" ya know something like that to show her you have given it thought and your handling this maturly, you may want to add things like "we are family and i dont want you thinking any different of me or my boyfriend, so if you have anything thats on your mind about it, i would appreciate you talking with me instead of assuming things" now maybe not that exact way you can mix it around however you want, this is basically what i would be telling my mom if i was in this situation. I hope things go smoothly for you and remember shes going to be just as nervous as you are, work through it together

hope i helped with this really loonnng reply

lol