No bleeding after taking birth control pills is also a normal reaction, some patients may have irregular vaginal bleeding due to adverse reactions after taking birth control pills. If there is a slight vaginal bleeding does not need special treatment, usually with the prolongation of the time of taking drugs, the symptoms will gradually ease. However, if the bleeding is heavy, it is necessary to take medication for symptomatic treatment, and if necessary, it is also necessary to change the contraceptive pill. The most common adverse reactions to contraceptives are gastrointestinal reactions, irregular vaginal bleeding due to hormonal changes, and some women may also experience obesity or hyperpigmentation, most of which can be gradually relieved after stopping the drug.