Drinking large amounts of alcohol without knowledge during the 10th day of pregnancy may affect the embryonic development because the early stage of pregnancy is a critical period for the development of the embryo and is susceptible to miscarriage due to adverse external factors. If you drink a lot and frequently during this period, it may affect the embryonic development and cause symptoms of pre-miscarriage such as vaginal bleeding and lower abdominal pain. If a small amount of alcohol once in a while does not affect the embryo, do not worry too much to avoid affecting the pregnant woman’s emotions, tension and anxiety can also have a negative impact on the development of the embryo. The teratogenic effects of alcohol are clear and can cause not only a variety of malformations, but also damage to the central nervous system of the fetus, so if you are actively preparing for pregnancy, you must avoid the bad stimulation of tobacco and alcohol for safety reasons, to provide a good environment for the development of the embryo.