Implantation bleeding, or fertilized egg implantation bleeding, is a small amount of vaginal bleeding that occurs when embryonic cells (globular cells before embryo formation) implant in the uterine lining, causing irritation and movement of the uterine lining. Implantation bleeding needs to be differentiated from menstruation, ectopic pregnancy, and bleeding from pre-eclampsia. The diagnosis is usually clear based on the bleeding situation and relevant auxiliary tests. 1. Judgment of implantation bleeding 1. Judgment according to bleeding (1) implantation bleeding: it usually occurs about 6-10 days after fertilization, with less bleeding and shorter bleeding time, calculated in hours, and the longest time will not exceed 48 hours; (2) menstruation: the bleeding time exceeds 12 days from the day of ovulation, with bleeding time of 3-7 days, with periodicity and more stable menstrual flow; (3) ectopic pregnancy. (3) ectopic pregnancy: abdominal pain and vaginal bleeding occurring 6-8 weeks after menopause, usually not exceeding the amount of menstruation, but dripping, if the vaginal bleeding is accompanied by severe abdominal pain, it is possible that the ectopic pregnancy has ruptured, so it is important to go to the emergency room at the first opportunity; (4) pre-eclampsia: the amount of bleeding is relatively small, mainly manifested by blood or bloody discharge in the leucorrhoea, sometimes dark red or brown, accompanied by vague pain in the lower abdomen. It is also necessary to consult a doctor and then decide how to further observe or treat. If a small amount of vaginal bleeding occurs, the patient should go to the hospital for HCG and progesterone tests and ultrasound examination, and if a gestational sac is found to exist in the uterus and the fetal heartbeat is normal, ectopic pregnancy and preterm abortion are excluded, then implantation bleeding is considered. Implantation bleeding needs to be treated according to the specific situation, as follows: 1. Physiological bleeding: usually no special treatment is needed, it will not affect the embryonic development, and it is usually enough to keep a calm mind, regular work and rest, and drink more water. In the early stage of pregnancy, we should eat reasonably, strengthen nutrition, avoid too intense exercise and heavy physical labor, prohibit sexual life, and avoid spicy and stimulating food. 2, pathological bleeding: if the laboratory test indicates low HCG, or ultrasound indicates no fetal buds and fetal heart, and no growth of HCG and ultrasound still no fetal heart are indicative of embryonic abortion, then it is necessary to consider performing clearance, and it is recommended to keep the cleared chorionic tissue for chromosome examination, which can help understand the cause of embryonic abortion and prepare for the next pregnancy.