If a woman has had unprotected sex, there is a prescription drug that can be taken that will inhibit pregnancy. It must be taken within 72 hours of sexual contact, with the second dose 12 hours later. The pill will not protect against sexually transmitted diseases, nor is it effective once pregnancy has occurred.
Science defines pregnancy as implantation of a fertilized egg in the wall of the uterus.
Emergency contraception works by interrupting the woman s menstrual cycle. The introduction of Estrogen and Progestin stops or delays ovulation, and may interfere with the fertilization of the egg. Because of this, the pill is classified as contraception and not abortion. Only a licensed physician may prescribe emergency contraception, as well as pharmacists in some states. Contrary to popular belief, parental consent is not necessary for women under age 18.