The first few days of pregnancy can be interpreted as the days before pregnancy or the early days of pregnancy. The days before pregnancy usually refers to the days before ovulation, as the follicle gradually matures and enters ovulation automatically, bleeding does not usually occur, but it cannot be excluded that a small number of people will be accompanied by slight bleeding. If bleeding occurs, it may be caused by the following reasons: 1. Fertilized egg implantation: After the fertilized egg is formed, it will gradually migrate from the fallopian tube to the uterine cavity for implantation into the endometrium. Therefore, in some women, the fertilized egg may rupture the small blood vessels in the endometrium during implantation, resulting in some degree of vaginal bleeding. In addition, if a woman does not have enough sex hormones in her body at the time of fertilization, the endometrium may be shed and vaginal bleeding may occur. However, the amount of bleeding at the time of fertilization is usually very small and may appear as a slight pink or brown stain that gradually disappears in 1-2 days, which is a normal physiological phenomenon. 2. Pre-eclampsia: If the bleeding is prolonged and heavy, accompanied by small abdominal pain, you need to consider that it may be a pre-eclampsia. If the fetus is developing well, you can use progesterone and other drugs under the guidance of the doctor to do fetal preservation treatment, if the fetus is developing abnormally, the pregnancy needs to be terminated and treated with a clean-up surgery if necessary. In early pregnancy, you should pay attention to nutrition, ensure sufficient rest, avoid straining, follow medical advice to supplement folic acid and maintain a good state of mind. Regular maternity checkups in early pregnancy, prohibit sexual intercourse, and stay away from radiation, radioactivity and other hazardous environments to avoid affecting fetal development.