How long does it take the birth control pill to come into affect?

I would wait until you are finished your first pack to have sex without any contraception then you can be sure that your protected to the best you can be. Remember to try and take the pill around the same time everyday to get your body into a cycleif you forget take it was soon as you remember but the longer you leave it %26amp; the more you forget to take your protection will drop and it's advised to use protection until the end of that pack just to be on the safe side :)