 Emergency contraception should be taken shortly before or as soon after intercourse as possible, as its efficacy decreases with increasing delay.Although ECP is considered an emergency measure, levonorgestrel ECP taken shortly before sex may be used as a primary method for woman who have sex only a few times a year and want a hormonal method, but don’t want to take hormones all the time.Failure rate of repeated or regular use of LNG ECP is similar to rate for those using a barrier method.