Biochemical refers to a biochemical pregnancy, usually occurring within 5 weeks of menopause. Biochemical pregnancy refers to a pregnancy in which the fertilized egg is not planted in the uterine lining, and as the hormone level decreases, signs of miscarriage occur, usually within 5 weeks of menopause, similar to the onset of menstruation, manifested by vaginal bleeding. Occasionally, biochemical pregnancies do not affect subsequent pregnancies, and do not require special treatment. If there are more than three consecutive biochemical pregnancies with one sexual partner, it indicates that there are recurrent miscarriages, and the doctor should be consulted for relevant examinations to clarify the specific causes and carry out targeted treatment, which are mostly due to chromosomal abnormalities. After pregnancy, you need to monitor the blood chorionic gonadotropin and progesterone value, if the value decreases with the increase of gestational weeks, you need to consider the possibility of biochemical pregnancy, and it is recommended to go to the hospital in time for a clear diagnosis.