If you can't feel the strings, they feel longer or shorter than usual, or you can feel the plastic of your IUD, there's a chance it may have moved. However, not being able to feel the strings doesn't mean your IUD has definitely moved. It's more likely that the strings have coiled inside your cervix.

Can Mirena move around?

Migration or displacement occurs when Mirena moves to another place in the body. This can happen after Mirena perforates the uterine wall and leaves the uterus. However, sometimes doctors don't find evidence of perforation.

What can happen if your IUD moves?

A partial expulsion is when the IUD moves out of its normal position at the top of the uterus. A partial expulsion might cause cramping and the woman might feel the strings are lower than they should be. Many doctors recommend checking strings on a regular basis to ensure proper position.