Regular vacation means menstruation. Ultrasound can be done during menstruation. Ultrasound is categorized into abdominal ultrasound and vaginal ultrasound, which should be chosen according to the situation. 1. Transvaginal ultrasound: During menstruation blood outflow, vaginal ultrasound is prone to cause upstream infection, so it is not recommended. However, if there is a suspicion of ectopic pregnancy, as long as there is not a lot of bleeding, transvaginal ultrasound can be performed because this method is relatively clear and has a high accuracy rate. 2. Transabdominal ultrasound: this method is the main way of examination during menstruation, and is suitable for women who do not have sex not during menstruation, the examination needs to hold urine to ensure that the bladder is full, the overall situation is not as clear as the vaginal ultrasound, but it is more convenient, and the clinical is also widely used. The accuracy of ultrasound examination after menstruation is lower than that after menstruation. Therefore, it is recommended to go to a regular hospital 3-7 days after the end of menstruation.