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Hormonal contraceptives such as birth control pills work by changing your usual menstrual cycle. The contraceptives contain synthetic versions of the female hormones that control the cycle. By maintaining the right levels of these hormones, they can prevent ovulation from happening so that there is no mature egg available to be fertilised. The hormones will also affect the womb lining, so it won’t go through the same cycle of thickening and then being shed during your period. However, you may still experience period-like bleeding when you are using birth control pills or other forms of hormonal contraception.
While all forms of hormonal contraception work in similar ways, there are some subtle differences in the way they affect your body. Different types of birth control pills and contraception can affect your menstrual cycle in different ways.