Hormonal methods include birth control pills (oral contraceptives), Depo Provera injections, and Norplant.
Injected: Depo Provera is a hormonal medication that is given by injection every three months.
In addition, once a woman stops using Depo Provera or Norplant, she may go many months before she begins ovulating again.
For example, if you use Depo-Provera for birth control, one of the side effects is missed periods and some weight gain.
If you're using a hormonal method of birth control, like the pill, the patch, or Depo-Provera, the hormones in your medication are determining when you get your period.