An ultrasound can detect a double cervix when you are pregnant. Double cervix has is a type of uterine developmental abnormality that occurs when the two sides of the paramesonephric ducts do not fuse during fetal life in the mother’s body and each develops into two uteruses and two cervixes. It usually occurs around the 6th week of pregnancy. If examined, it can usually be detected by doing a tubal iodine-oil angiogram or ultrasound of the uterine adnexa when not pregnant, and it can be seen by ultrasound after pregnancy, but it is best detected at the pregnancy checkup, where it can be surgically corrected in time for symptomatic treatment. Most women with double cervix have no special symptoms, if it is a little more serious, there is a longitudinal separation at the vagina, then it may be possible to have repeated miscarriages or preterm labor after pregnancy, so it is necessary to do a good pre-pregnancy examination.