The main functions of LETIN Progesterone Soft Capsules are: 1. To treat menstrual disorders, especially anovulatory menstrual disorders. 2. Also used for fertility preservation treatment, for preterm abortion caused by luteal insufficiency, such as lower abdominal pain and small amount of vaginal bleeding. For fetal preservation treatment, further gynecological ultrasound and blood progesterone are usually required. If the gynecological ultrasound indicates early intrauterine pregnancy and low progesterone level, progesterone soft capsules can be taken to preserve the pregnancy. During the period of fetus preservation, it is necessary to prohibit sexual intercourse, pay attention to rest, avoid strenuous exercise, and generally review the medication in clinic after one week. In addition, it should be noted that progesterone soft capsules may cause headache and dizziness during the medication period, so it is recommended that patients should take them at night before going to bed to alleviate their uncomfortable symptoms.