Usually when you get a period twice in a month after emergency contraceptive pills is very common. Because emergency contraceptive pills causes menstrual irregularities and you will have your menses twice in a month. Very rarely during pregnancy you can have menses twice in a month specially your normal period and 14th or 15th day of your period that is known as an implantation bleeding. It means that you have consumed and then you have your periods. The most common cause of having periods two times in a month is emergency contraception pill.