Bleeding all the way through the 18th week of pregnancy needs to be treated according to the cause. If the bleeding is caused by placenta previa, bed rest, fertility preservation treatment and regular checkups are needed. If it is caused by preeclampsia, it should be treated with medication to keep the fetus alive. 1. Placenta previa: when ultrasound suggests that the lower edge of the placenta reaches or covers the endocervical os, the placenta previa can cause vaginal bleeding, combined with clinical manifestations and ultrasonography can assist in the diagnosis, and need to follow the doctor’s instructions for proper bed rest, appropriate fertility preservation treatment, to keep the perineum clean in order to prevent infection, and if necessary, give medication to stop the bleeding treatment, and check the ultrasound. 2. Pre-eclampsia: Pre-eclampsia can also cause vaginal bleeding, accompanied by pain in the lower abdomen, ultrasound examination of the fetus is well developed, combined with the clinical manifestations can assist in the diagnosis. It is necessary to follow the doctor’s advice to rest, reduce the amount of activity, and give nifedipine and other drugs to inhibit contractions, and give antibiotics to prevent infection treatment. 3. Cervical polyp: It can also cause repeated vaginal bleeding without abdominal pain, and gynecological examination can assist in the diagnosis. The gynecological examination can assist in the diagnosis. The polyp removal operation can be carried out according to the doctor’s instructions, and the removed tissue can be sent to the pathology examination. The 18th week of pregnancy has been bleeding when you need to go to the hospital in time to find out the cause, and timely treatment, follow the doctor’s instructions for medication.