A small amount of bleeding on the tenth day of artificial insemination may be a normal physiological condition, or it may be caused by pathological reasons such as pre-miscarriage. 1. Physiological reasons: artificial insemination is an artificial assisted reproduction technique, in which sperm is injected into the female reproductive tract through non-sexual intercourse to fertilize the female, which should be operated by a professional physician. A small amount of vaginal bleeding on the tenth day after insemination may be caused by the fertilization of the egg, which can last for 3~4 days, is a physiological phenomenon and does not require special treatment. 2. Pre-eclampsia: It can also cause a small amount of vaginal bleeding, accompanied by paroxysmal pain in the lower abdomen, and can be diagnosed by combining progesterone, estradiol and blood HCG (human chorionic gonadotropin) levels. Until the ultrasound diagnosis is clear, rest is prescribed and the pregnancy is reviewed at a later date. However, when the ultrasound is clear that there is an intrauterine pregnancy, medications such as progesterone need to be given to preserve the pregnancy. A small amount of bleeding on the tenth day of artificial insemination requires prompt medical attention in order to identify the cause and deal with it aggressively.