Is it harmful to take emergency contraception once in a while?

Emergency contraceptives occasionally eat once, equivalent to do abortion, but do not advocate using this method to contraception, but only last resort remedies. Its harm is mainly endocrine disorders, if occasionally eaten once, the impact is not very big. But pay attention to the menstrual situation after taking the pill, some people in the first month of taking the pill menstrual disorder, so be sure to do strict contraception.