Taking birth control pills can delay menstruation. Taking birth control pills can inhibit and delay ovulation and also inhibit the endometrium, which can postpone the next menstruation, but also make the menstruation early, so taking birth control pills can easily cause endocrine disorders, which can easily cause menstrual disorders. After taking the pill, if there is a delay in menstruation, you can observe and see, generally not more than a week is normal, if more than a week, may be caused by endocrine disorders, the best blood test sex hormone six, under the guidance of the doctor reasonable regulation, usually pay attention to drink more water, strengthen diet and nutrition, it is best not to stay up late, do not eat spicy and stimulating food, it is recommended that regular medical checkups, usually do a good job of contraceptive measures.