There is still a chance of pregnancy after taking emergency contraceptive pills, because emergency contraceptive pills are not 100% contraceptive, there will be a 20% chance of failure, so after taking emergency contraceptive pills, you can be in about 12 days time, early pregnancy test test, to rule out the possibility of their own have not been conceived. Some women take emergency contraceptives late, like close to 72 hours or more than 72 hours, which greatly reduces the effect of emergency contraceptives and can cause the chances of conception. If you are not pregnant after the test results, wait patiently for your period and watch for changes in your menstrual flow, as birth control pills can cause a thickening of the lining, which can also cause an increase in menstrual flow. If you are pregnant, it is important to consider carefully whether you want to continue the pregnancy or terminate it.