Fertility preservation is generally used in both cases of preterm labor and preterm labor. One week of fetal preservation for preterm miscarriage requires ultrasound, progesterone and blood HCG tests, while ultrasound and cervical canal length tests are required for preterm preterm labor. 1. Pre-eclampsia: It can cause paroxysmal abdominal pain, accompanied by a small amount of vaginal bleeding and other symptoms, you can follow the doctor’s instructions to give progesterone and other drugs to protect the fetus treatment, after one week of treatment should be carried out ultrasound to learn about the development of the embryo, and should be carried out on the level of progesterone and blood HCG (human chorionic gonadotropin) test to assess the effectiveness of the treatment. 2. Preterm labor: Regular or irregular lower abdominal pain after 28 weeks of pregnancy, which may be accompanied by shortening of the cervical canal. Ritodrine and other drugs should be given to inhibit contractions to protect the fetus, and ultrasound and cervical canal length should be repeated one week later to know the effect of treatment. Electrolyte tests should also be performed to avoid adverse drug reactions.