The first thing you need to do in this case is to go to the hospital as soon as possible to have a blood test to check the blood HCG value to exclude the delay in menstruation caused by pregnancy. Taking the pill is not a 100% contraceptive measure, no contraceptive method is foolproof, and taking the pill is no exception. If the blood HCG value rises, it indicates that taking the pill has failed and the patient is pregnant. In this case, it needs to be combined with gynecological ultrasound, if the gynecological ultrasound suggests intrauterine pregnancy, the patient has no requirement for childbirth, terminate the pregnancy as soon as possible. If the gynecological ultrasound indicates ectopic pregnancy, combined with the blood HCG value, choose conservative treatment or surgical treatment. If the blood HCG value does not rise, consider that it is caused by menstrual disorders, and consider progestin therapy, such as progesterone injection and dihydrogesterone tablets.