Women on birth control pills take the tablets once a day. They have many other advantages, such as relief during menstrual cycles, and can help clear acne up. However, they also carry some major disadvantages, including weight gain or loss, depression, and the fact that they must be taken daily in order to be most effective. They do not protect against sexually transmitted diseases, though. A physician must prescribe the pill to the woman, though this usually isn't a problem.
Doctors are usually willing to prescribe the pill, with or without parental consent.
The third option is a little less popular, though it has recently begun to increase in popularity. There are two ways to have this procedure done. The first is by having an insertion within 5 days of unprotected sex. The other way is to take two doses of pills 12 hours apart beginning within 72 hours of unprotected sex. There are, however, numerous risks involved and this method should only be considered if you have unprotected sex, with no other contraceptive devices used.