Unwanted pregnancy can also occur after IUD. The success rate of contraception after IUD can reach 95%, so there are 5% of people who can have unwanted pregnancy, mostly because the position of the ring has changed or the ring has fallen off, which can cause pregnancy, because the ring is placed in the uterine cavity, first of all, it can prevent the sperm from moving up, avoid the sperm and egg to meet, and also can make the endometrium in the uterine cavity appear inflammatory changes, which is not conducive to the fertilization of the egg, so that it can It can also cause inflammatory changes to the endometrium in the uterine cavity, which are detrimental to the fertilization of the egg. If the position of the ring is abnormal, these effects will be reduced or ineffective, and pregnancy may result. If it is not time for your period to come, it is important to go to the hospital for a checkup to avoid an unplanned pregnancy.