Generally bleeding for 3~7 days after hysterosalpingography or uterine ultrasonography is normal, but there will be individual differences. 1. Hysterosalpingography: it is an examination method to know whether the fallopian tubes are open or not, as well as the location of blockage and the morphology of the uterine cavity, which should be operated by professional physicians, and contraindications such as acute inflammation of the reproductive tract should be ruled out before the operation. Before the operation, sexual intercourse should be prohibited and 3~7 days after menstruation is clean. Due to the uterine operation, there will be a small amount of vaginal bleeding after the operation, which usually lasts for about 3~7 days is normal. 2. Uterine ultrasonography: It is used to dilate the uterine cavity by injecting contrast agent into the uterine cavity and observe endometrial polyps, submucosal fibroids, endometrial cancer and uterine deformities and other lesions under ultrasonography. There will be a small amount of vaginal bleeding after the contrast, which usually lasts for 3 to 7 days is normal.