They work by shutting off the normal monthly cycle that makes an egg, as well as making the womb an unfriendly place to both sperm and the fertilized egg.
Most women can use birth control pills.
This includes young women who have recently started a normal cycle, as well as women in their 40's. There are over 30 different types of birth control pills. The pills usually contain both the female hormones, estrogen and progesterone, although progesterone-only pills are available. A healthcare provider will help you find the right one for you. The first pill starts with the first few days of a woman s period.