How long can the menstrual cycle be delayed after taking emergency contraception?

After taking emergency contraceptive pills, the extent of menstrual delay varies from person to person. In most cases, the menstrual period may be delayed by about a week. Emergency contraceptive pills mainly contain high doses of progestin, which significantly alters hormone levels in the body and disrupts the normal menstrual cycle regulation mechanism.

Some women are more sensitive to hormonal changes, and their menstrual delay might last longer—sometimes up to 10 days or even half a month. However, a few individuals experience minimal effects from the medication and maintain relatively normal menstrual cycles. If menstruation does not occur for more than one month after taking the pill, pregnancy should be considered, and a timely gynecological examination is recommended. Moreover, emergency contraceptive pills should not be used as a regular contraceptive method; frequent use may increase the risk of menstrual disorders. It is advisable to adopt more stable, long-term contraceptive measures.

In addition, factors such as psychological stress and changes in lifestyle may work together with the emergency contraceptive pill to affect the menstrual cycle. If the menstrual delay is prolonged or menstrual irregularities or abnormal bleeding occur, prompt medical consultation is recommended. A physician can evaluate the specific cause through examination and provide appropriate guidance for regulation.