Oral Yutin emergency contraceptive pills can cause a delay in menstruation for 7-10 days because it causes changes in endocrine hormones in the body, which may lead to menstruation in 7-10 days. However, if you have not had your period for more than 10 days, it should be taken very seriously because the emergency contraceptive pill is not 100% contraceptive and there is a 20% chance of failure. Therefore, you can buy a pregnancy test about 12 days after intercourse and take a test in the middle of the urine to rule out the possibility of conception. If the endometrial thickness is very thick, above 0.8 cm, we can only wait patiently for menstruation and do not recommend taking any oral medication. If the endometrium is very thin, there is a menstrual disorder and you need to take certain drugs orally to promote menstruation.