1. Definition and symptoms of pregnancy biochemistry Pregnancy biochemistry refers to abnormal embryonic development due to chromosomal abnormalities or other reasons after the fertilized egg implants, eventually leading to spontaneous abortion. Common symptoms include vaginal bleeding, abdominal pain, uterine contractions, etc. At this time, timely medical diagnosis and treatment is required to avoid adverse effects on the female body. 2. Causes of pregnancy biochemistry 1. Chromosomal abnormalities: Chromosomal abnormalities in the embryo are one of the main causes of pregnancy biochemistry. This condition is usually due to a chromosomal problem in the sperm or egg itself, or in the