The difference between fertilized egg implantation bleeding and menstruation lies in the time of bleeding, amount of bleeding, color of bleeding, nature of bleeding, and symptoms. 1. Bleeding time: bleeding from fertilized egg implantation usually occurs a few days before the menstrual cycle and usually lasts for 2 to 3 days, while menstrual bleeding occurs during a menstrual cycle and lasts for 4 to 7 days. 2. Bleeding volume: the bleeding volume of fertilized egg implantation is small, and the bleeding volume of menstruation is large. 3. Color of bleeding: the color of bleeding is light and bright red when the fertilized egg is implanted, while menstrual bleeding is usually dark red. 4. The nature of bleeding: the bleeding of fertilized egg implantation is usually coagulated, while menstrual blood is basically non-coagulated. 5. Symptoms: Fertilized egg implantation bleeding usually has no accompanying symptoms, but menstruation is usually accompanied by lower back pain, lower abdominal pain, chest swelling and pain. If there is no contraception and a small amount of bright red bleeding occurs a few days before menstruation, it is recommended to go to the hospital in time to check whether you are pregnant. At this time, you should avoid sexual intercourse, pay attention to rest, and keep your private parts clean and hygienic.