1. Birth Control http://stayteen.org/sex-ed/birth-control-explorer

2. Abstinence

3. The Implant A tiny matchstick-sized rod that goes in a girl's upper arm; it's good for up to three years.

4. The Shot (Depo) Just what it sounds like—a shot that a girl gets; you need a new shot once every three months.

5. The Pill A pill a girl takes at about the same time every day; there are lots of different options.

6. Condoms Covers the guy's penis—the sperm goes in the condom and not in the girl's body.

7. Emergency-Plan B A pill that can stop a pregnancy before it starts; it's meant as a backup plan, not regular birth control.