The embryo in the 3rd month of pregnancy is still unstable and prone to miscarriage, so pregnant women with vaginal bleeding and no abdominal pain need to pay attention, go to the hospital for ultrasound examination in time to observe the development of the fetus and take appropriate treatment measures according to the cause. 1. Pre-eclampsia: the embryo in the 3rd month of pregnancy is unstable and will have the possibility of miscarriage, go to the hospital immediately for examination, if it is pre-eclampsia, you should absolutely rest in bed and follow the doctor’s advice Take or inject fetal preservation drugs; 2. Placenta praevia: If the placenta is attached to the lower segment of the uterus, or even the edge of the placenta reaches or covers the inner cervical opening, it will easily lead to vaginal bleeding after intercourse, and you should pay attention to bed rest and not to stand and walk, otherwise it will lead to increased bleeding. When resting in bed, you can put your buttocks up appropriately to facilitate the upward movement of the placenta. If there is pain in the stomach or there is hardness in the stomach, promptly use birth control drugs to keep the fetus from causing miscarriage; 3. Vaginal and cervical diseases: vaginal bleeding in the third month of pregnancy may be due to cervical polyps, cervicitis or vaginitis itself, and the bleeding is often bloody discharge. If it is a cervical polyp, in mild cases you can watch and wait, in severe cases the cervical polyp needs to be removed. If it is an inflammatory lesion of the vagina and cervix, follow the doctor’s prescription for anti-inflammatory treatment.