Short-acting contraceptive pills are mainly divided into three photos of single tablets or double photos, the main components are progestin and estrogen, are taken in a cycle of 28 days. Generally, the pill is taken on the 5th day from the day of menstruation, for 22 days in a row, with no interval in between, to prevent pregnancy for one month. If there is an interruption in the cycle of taking the drug, it may lead to bleeding or contraceptive failure. Do not use contraceptive pills often as they may cause some side effects such as nausea and vomiting, irregular uterine bleeding, breast tenderness, dizziness and weakness or menstrual changes. It is better to use contraceptive devices or IUD to achieve contraceptive effect.