Biochemical pregnancy is a condition in which the sperm and egg do not successfully attach to the uterine lining, but are aborted with menstruation. Usually, the fertilized egg will be aborted naturally within 50 days, and it usually occurs in the early stage of pregnancy, so most women think that it is just a delay in menstruation. Biochemical pregnancy will also have a series of symptoms, such as abdominal pain, early pregnancy test can not reach a strong positive test, ultrasound examination can not see the gestational sac and a series of clinical symptoms. Some of the patients with biochemical pregnancy will feel a series of symptoms such as abdominal distension and pain or abdominal cramps, which are mainly caused by pelvic congestion, and some women do not have any symptoms. Under normal circumstances, the combination of sperm and egg will reach the uterine lining and implant in the uterus, and the pregnancy can be detected through the early pregnancy test at about 14 days after implantation, and under normal circumstances, the color of the test paper will deepen day by day until it becomes a strong positive, while the test results of biochemical pregnancy patients will become fainter and fainter day by day and won’t reach the state of strong positivity. In normal pregnancy, the pregnancy sac can be seen in the uterine cavity under ultrasound after 40 days of menopause, while in biochemical pregnancy, the pregnancy sac cannot be seen within 6-8 weeks of menopause. If a woman has the above symptoms, then most of them are caused by biochemical pregnancy, biochemical pregnancy actually does not have a great impact on women and harm, so there is no need to worry too much.