Normally, you should not get pregnant again after an IUD is placed. This is because the IUD itself acts as a contraceptive and its components may contain prostaglandins, hemostatic agents, progestins, etc. The IUD will interfere with the transportation of sperm in the uterus and affect the implantation of a fertilized egg, so there should be no further pregnancies after the IUD is placed. However, if the IUD becomes ectopic, it will not be able to act as a contraceptive and you may become pregnant. In addition, even if the IUD is not ectopic, the probability of contraception does not reach 100%, clinical data show that the probability of pregnancy after IUD is 3%-4%. The common reasons for pregnancy after IUD are as follows: 1, the position is not placed correctly, the ring is not placed at the bottom of the uterus, then it can not play a role in contraception, or the model is not properly selected, at that time, the uterus is small, the ring model is larger, resulting in the ring in the uterus to shift or fall off, and can not play a role in contraception; 2, daily life, such as bathing, squatting and other inadvertently make the ring fall off or the ring position decline; 3, after the ring sex Excessive sexual life after the implantation of the ring, resulting in the ring shifting or falling off; 4, suffering from diabetes and other diseases, which will directly lead to increased acidity of body fluids, the birth control ring will gradually be corroded in the body, resulting in its failure.