HCG values in biochemical pregnancies are usually low, around a few dozen to a hundred or so, and usually rarely in the hundreds or thousands. The exact value will not exceed how much is not certain, or need to be based on the woman’s specific situation. Biochemical pregnancy, also known as hidden abortion, refers to a kind of natural abortion phenomenon that occurs before menstruation, mostly due to the embryo did not succeed in landing caused by. HCG levels in biochemical pregnancies are low at the time of diagnosis and rise slowly, possibly dropping soon after the pregnancy is detected. Women with biochemical pregnancies tend to experience vaginal bleeding, and uterine contractions stimulated by the embryo and blood can produce abdominal pain, which is often mistaken for menstruation because of the proximity of the onset of symptoms to menstruation. Biochemical pregnancies are often accidental and generally do not require treatment, but if they occur repeatedly the cause needs to be actively sought and treated.