So it's one of the most reliable contraceptives available. Since its introduction in the United States, millions of American women have started using it. Most women who become pregnant after stopping the injection do so within one year.
Most women can.
However, there are some women who should not use it. Tell your health care provider if you think you might be pregnant or if you have had any unusual vaginal bleeding. Also tell them if you have a history of breast cancer, stroke, blood clots, or liver disease.