Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hormonal contraception is one of the most popular birth control methods, designed to control fertility and prevent unwanted or unplanned pregnancy. According to medical evidence, methods of contraception include birth control patches, injections, implants, intra-uterine system (IUS), progestogen-only pill and birth control ring. Recently, scientists announced that some of the contraceptive methods may increase risk of blood clot. Learn more about the hormonal contraception, its pluses and minuses in this book.