Taking the pill may cause a delay in menstruation because the pill is an estrogenic drug that may have some effect on menstruation. Some people may experience withdrawal bleeding after taking emergency contraceptive pills, and some may also experience various symptoms such as menstrual disorders, early or late menstruation, which are all side effects of taking birth control pills. Women who have more side effects may also experience dizziness, headache, nausea, vomiting or palpitations, insomnia and other symptoms. Taking the pill for too long or taking the emergency contraceptive pill too often may lead to various problems such as infertility, so it is best for women not to take the pill too often in order to avoid huge effects on their bodies. When there are symptoms of delayed menstruation, it is recommended that it is best to undergo timely conditioning treatment.