Emergency contraceptives, with their hormonal content, do cause irregular periods when taken orally. But it usually does not cause menstruation half a month earlier, such a cycle is there is a serious disruption. It may not be menstruation, it is emergency contraceptive pills, brought about by the withdrawal of bleeding, belong to the adverse reaction of the drug and caused. It is recommended to observe the bleeding for 3-7 days, as long as it ends within seven days, it will not affect your health. However, the withdrawal bleeding may cause the next menstrual period to be delayed, so it can be observed once. And some people can cause the menstrual cycle to be disorganized for three months after taking emergency contraceptive pills orally. You can also observe, if there is frequent confusion, as far as possible to go to the hospital registered gynecologist for hormone six examination. Depending on the situation, you can take oral medication to regulate the artificial cycle, such as short-acting contraceptive pills, Yosmin and Yosiyue, to achieve the purpose of restoring normal menstruation.