In this case, the pill should refer to the emergency contraceptive pill. Oral emergency contraceptive pills may affect menstruation. Emergency contraceptive pills are levonorgestrel preparations, which can inhibit ovulation and prevent fertilization of the egg, and increase the consistency of cervical mucus, sperm penetration resistance increases, so as to play the role of contraception, usually 3 to 5 days after taking the pills will lead to endometrial stripping and the appearance of menstruation-like vaginal bleeding, so it is easy to appear menstrual disorders. Emergency contraceptive pills contain a large amount of progesterone or estrogen, which can easily affect ovarian function, leading to endocrine disorders and menstrual disorders. For women who need to take contraceptive pills, no matter which kind of contraceptive pills are hormonal preparations, so it is recommended that they take them under the guidance of a doctor and not blindly use them.