20 days of pregnancy is about 35 days after menopause, the fertilized egg in the uterine cavity is relatively small, and the bed is not very solid. Most women who have a miscarriage will experience a small amount of vaginal bleeding and a swollen stomach. Since this symptom cannot be identified with an ectopic pregnancy, it is necessary to go to the hospital as soon as possible to do a blood test to check the concentration of HCG in the blood, and then check it again after 48 hours, and if the concentration of HCG can reach double, it should be taken into account that it is a miscarriage. After the miscarriage, you must pay attention to rest, if you do not get timely treatment in the early stage of pregnancy, the condition will continue to develop, resulting in heavy bleeding and even tissue discharge, which may lead to complete or incomplete miscarriage.