Bedtime bleeding and menstrual bleeding can be judged from bleeding duration, bleeding volume and bleeding pattern. 1. Duration of bleeding: the duration of menstrual bleeding is the time of menstruation, usually from 3 days to 7 days, and the duration of menstrual bleeding in women with regular menstruation basically stays relatively unchanged, whereas the bleeding of implantation usually lasts from 1 day to 3 days, which is a shorter duration. 2. Bleeding volume: menstrual bleeding is usually about 20 ml to 60 ml, usually dark red non-clotting blood, while the implantation bleeding is usually light red blood-like, mixed with vaginal secretions. 3. Bleeding pattern: menstrual bleeding is usually after a menstrual cycle, which can be deduced from the menstrual cycle, while implantation bleeding usually occurs after the fertilized egg has been deposited, which can be deduced from the time of the last intercourse. If a woman suspects that she is pregnant, it is not accurate enough to judge by the bleeding alone. It is recommended that she go to the hospital in time for blood HCG and ultrasound examination of the uterine adnexes to determine whether she is pregnant or not.