The copper IUD is placed in the uterus and cannot be felt, not even during sports or sex.
After the IUD is placed, the wires of the IUD are usually cut 2 to 3 cm from the cervix. This makes it easy to remove the coil later. You can feel the threads with your finger. Sometimes the threads are curled around the cervix and it is more difficult to feel them. The threads are so supple that you cannot feel them during sex.
If you feel a hard part, this means that the coil is no longer in place and you should see your doctor or midwife.