Fertility preservation progesterone generally need to be injected for about seven days, due to the different physical conditions of individuals, the number of days of injection will also vary, it is recommended that according to their own actual situation under the guidance of the doctor to choose reasonably. Fertility preserving progesterone is a more commonly used drug in the clinic, which has a very good effect on women’s fertility preservation and hormone regulation during pregnancy. However, the main drug may cause some adverse reactions, such as dizziness, headache, nausea, fatigue, etc., the symptoms are generally mild, will not affect the normal life too much. Usually birth control progesterone to play about seven days, usually not more than two weeks, but does not rule out the existence of special circumstances. It is recommended that women undergo regular maternity checkups during pregnancy to detect problems and intervene in a timely manner, so as not to cause delays in the disease and other serious effects.