If too much progesterone is injected during birth control, besides possibly affecting the development of the fetus, it may also increase the risk of diseases such as localized hard nodules and other adverse reactions such as nausea and dizziness in pregnant women. 1. Affecting fetal development: progesterone can be used to treat preeclampsia, and if too much is injected during fetal preservation, it may stimulate the fetus and affect its growth and development, which may cause developmental malformations such as neurovascular or reproductive organs. 2. Prolonged application of large doses of progesterone for fetal preservation may increase the risk of localized sclerosis, localized aseptic cysts as well as artificial seborrhea and other diseases. 3. Other adverse reactions: dizziness, headache, nausea, breast swelling and pain, urticaria and other symptoms, long-term use can also cause liver function abnormalities, weight gain, swelling and other symptoms. Therefore, the injection of progesterone for fetal preservation should be used strictly under the guidance of a doctor, and should not be used excessively to avoid the occurrence of the above adverse symptoms, and at the same time, the use of this product should be prohibited in patients with severe liver injury.