The woman with the ring may still be pregnant, women placed the intrauterine sterilization ring in the case of pregnancy is common in the following reasons; first, the displacement of the birth control ring, women placed the birth control ring, due to excessive menstruation or strenuous exercise, etc., may lead to the displacement of the birth control ring. There are also women who place the IUD because the uterine cavity is large, so the IUD is out of its normal position and falls close to the endocervical opening, this IUD can not play a contraceptive role. Secondly, the time limit of the IUD has expired. Generally speaking, the IUD can be used for five years, and the effect of contraception will be significantly reduced after more than five years. Therefore, women should do ultrasound every year to find out whether the ring is in the normal position after the ring has expired, and the ring should be replaced in time.