The lack of menstruation in the second month after taking birth control pills may be caused by bad living habits, endocrine disorders caused by birth control pills, pregnancy and other factors. If it is caused by bad habits, you should adjust your daily routine, keep your mood happy and eat a balanced diet; if you have endocrine disorders, you can take oral progesterone drugs under the guidance of your doctor. 1. Bad habits: High mental stress, staying up late for a long time with poor sleep quality, unhealthy diet, and eating spicy and cold foods may all lead to menstrual disorders. It is recommended that patients actively adjust their daily routine, maintain a good mood and adequate sleep, and adhere to a healthy diet to promote the return of menstruation to normal. 2. Endocrine disorders: If you have your period in the first month, and then you don’t have intercourse and don’t have your period, it is considered that the estrogen and progesterone in the birth control pills affect the normal estrogen and progesterone balance of the body, causing endocrine disorders, which will lead to delayed menstruation. Patients can be treated with oral progesterone drugs such as medroxyprogesterone and dydrogesterone under the guidance of a doctor. 3. Pregnancy: It may also be caused by pregnancy, and you can go to the hospital to determine whether you are pregnant through a pregnancy test. If you are pregnant, but do not have the requirement to have children, and take emergency contraceptive pills, you need to confirm the diagnosis of intrauterine pregnancy, you can follow the doctor’s advice to terminate the pregnancy by artificial abortion or drug abortion. Therefore, when the situation of delayed menstruation occurs after taking contraceptive pills, it is recommended to go to the hospital in time for examination and treatment according to medical advice.