If there are signs of miscarriage after pregnancy, you need to take treatment to keep the baby alive. Signs of miscarriage include bleeding, lower abdominal pain, lower back discomfort, etc. If there is no clinical manifestation of miscarriage, but the test results are abnormal, i.e., blood beta-HCG doubling slower than normal, progesterone lower than normal, estrogen rise lower than normal, ultrasound suggesting embryonic growth retardation, etc., it is also necessary to take birth control treatment. In addition, patients with previous spontaneous miscarriage need to pay attention to regular hospital checkups for routine fetal preservation.