The process of implantation, also known as implantation, is when the fertilized egg enters the endometrium and unites with the maternal uterine wall. Implantation usually begins on the 5th-6th day after fertilization and is completed on the 11th-12th day. Normally, there is no vaginal bleeding during fertilization, but when a woman has low hormone levels or endocrine disorders, vaginal bleeding during fertilization may occur. The amount of bleeding during fertilization is usually small, slightly pink or brown in color, and may also occur in the form of spotting or just blood in the leukorrhea. Bleeding from fertilization may be due to changes in the woman’s hormone levels, which cause a small amount of endometrial shedding. Usually, as hormone levels increase, the bleeding symptoms will gradually subside and there will not be bright red blood, nor will it affect the normal fertilization and development of the fertilized egg. If there is a small amount of bleeding from the fertilized egg, it is important to keep your personal hygiene and to rest and avoid getting cold during this period. If the bleeding continues, or if the amount of bleeding increases and becomes bright red in color, or if it is accompanied by abdominal pain, you need to go to the hospital in time to have blood HCG, ultrasound and other relevant examinations to determine if the vaginal bleeding is caused by ovulatory bleeding, pre-eclampsia, ectopic pregnancy, uterine polyps, reproductive tract tumors, etc. After the diagnosis is confirmed, treatment should be carried out under the guidance of the doctor.