When women take oral contraceptives, it is a hormonal drug that will change the endocrine hormones in the body to produce some changes, which will cause menstruation to be delayed for 7-10 days, usually not more than 10 days will come to menstruation. But because the contraceptive pill is not 100% contraceptive, when there is a delay in menstruation, as far as possible, or buy a pregnancy test first test, to rule out the chances of pregnancy. Because some women will not have a period if they are pregnant, you can be patient and wait for 10 days to rule out pregnancy, as long as you get your period within 10 days, there is no problem. However, if the delay of 10 days has not come to menstruation, this time you need to go to the hospital for ultrasound examination, to determine the thickness of the uterine lining, is not due to hormonal reasons for the thinning of the lining of the uterus, you can take some oral progesterone to help the lining of the uterus to grow, and quickly restore menstruation.