A biochemical abortion is a type of miscarriage that occurs when the fertilized egg formed by the union of the sperm and egg does not properly settle in the uterine cavity. Since the fertilized egg does not settle properly, the endometrium will shed normally and occasionally the menstruation will occur and the fertilized egg will flow out of the body with the menstruation. This process is similar to the menstrual cycle, which takes about 5-7 days to clear. However, if a woman has gynecological inflammation, it may take longer, even up to a month in some cases. A small percentage of women with biochemical pregnancy may experience significant abdominal pain, but the degree of pain varies from person to person, with some people experiencing persistent abdominal pain and most people experiencing only transient abdominal pain. The pain is similar to that of menstruation, and some may have no symptoms at all. The main characteristic of a biochemical pregnancy is the delay in menstruation. If an HNCG test is done with a delay in menstruation and the result is elevated but the menstruation occurs again a few days later, then this is a biochemical pregnancy. A biochemical pregnancy is not strictly speaking a real pregnancy and therefore the bleeding does not last too long and clears up in about a week. After a biochemical abortion, women need to pay more attention to diet and rest, never drink alcohol and stay up late, and forbid sex for a month.