If vaginal bleeding occurs in the fifth week of pregnancy, it is often caused by the following reasons: 1. After exertion or with a history of trauma, or with intercourse, external stimulation can cause the phenomenon of detachment between the uterine wall and the gestational sac, which clinically causes pre-eclampsia. 2. If some kind of medication is taken during pregnancy, such as blood-activating drugs, it may also lead to vaginal bleeding. 3. embryonic genetic deficiency, so it may also lead to vaginal bleeding. In this case, it is difficult to settle the fetus successfully even if it is treated with antiretroviral therapy, and if it is unsuccessful, it is recommended to give an operation to remove the fetus as soon as possible. After the operation, you must take a good rest to make the uterus recover as soon as possible, and it is recommended to have a health check before the next pregnancy.