However, some people may experience a small amount of vaginal bleeding due to the rupture of a small number of blood vessels in the endometrium when the fertilized egg is laid, but this bleeding is relatively small, in the form of blood-colored or drip-like bleeding in the leukorrhea, which lasts for 3-5 days and is not the same as the usual amount of menstruation. However, if the pregnancy is confirmed and the vaginal bleeding is the same as the menstrual flow, it is not normal and may be caused by biochemical pregnancy or inevitable miscarriage. Further tests can be done to check the chorionic gonadotropin in the blood. Generally, if the intrauterine pregnancy is normal it will double within 48 hours, but if it does not double normally, this pregnancy may not be normal.