Vaginal ultrasound can be performed when you are pregnant, but it is not recommended for non-essential cases of pregnancy bleeding. Vaginal ultrasound is mainly used for ovulation monitoring, and for the diagnosis of ectopic pregnancy, uterine occupational disease, polycystic ovary syndrome and chocolate cysts. Bleeding during pregnancy indicates the possibility of preterm miscarriage and usually vaginal ultrasound cannot be performed, as it tends to cause increased bleeding, as well as the chance of infection, which may develop into inevitable miscarriage and endanger the safety of the fetus. At this time, abdominal ultrasound is an option. If the disease is acute and the abdominal ultrasound cannot visualize the lesion, vaginal ultrasound can be considered. However, it should be noted that the patient should urinate after the examination, lie down and relax, enhance hygiene and disinfection to avoid infection that may lead to miscarriage, monitor the fetal heartbeat during the operation to determine the condition of the fetus, and stop the operation in case of abnormalities. In addition, it is recommended that pregnant women with vaginal bleeding should consult a doctor for a detailed examination. If the amount of bleeding is low, you can be hospitalized in time to apply medication for fetal preservation under the guidance of a doctor. At the same time, it is prohibited to have sex, pay attention to a balanced diet, avoid eating cold and spicy food, eat meat, eggs, milk rich in protein, and fruits and vegetables rich in vitamins, and try to rest in bed and avoid strenuous exercise to ensure the healthy development of the fetus.