This document provides information about various contraception methods for preventing teen pregnancy. It discusses that most teen pregnancies are unintended, and lists common forms of birth control like condoms, pills, implants, injections and Plan B. The pill works by using hormones to thicken cervical mucus and thin the uterine lining. Pros of the pill include reduced cramps and acne, while cons include potential blood clots and needing to remember to take it. Condoms are highly effective against pregnancy and STDs when used correctly. Emergency contraception like Plan B can prevent pregnancy up to 72 hours after unprotected sex. Abstinence is the only 100% effective method against pregnancy and STDs.