If a woman is using the IUD for regular birth control, she will need to have a regular follow-up ultrasound to see the position of the IUD after the IUD is placed. The best way to find out if the ring has shifted is to have regular vaginal ultrasound or abdominal ultrasound to accurately determine the position of the ring, since the ring is likely to shift down or fall out as the menstrual blood is discharged. It can also be indirectly determined by the woman’s menstrual condition, because after the ring has shifted or fallen off, it may cause incomplete menstruation and even abnormal uterine bleeding. Therefore, for women who have just had the ring placed, the doctor will recommend that the ultrasound be repeated in the first, sixth and twelfth month after the ring is placed to determine if the ring has shifted downward.