You can feel the IUD strings are longer, shorter, or missing
You feel the hard plastic part of the IUD at your cervix or in your vagina
You have new or worsening pelvic pain
You have cramping that is stronger than usual
You have unusual vaginal bleeding or spotting
You have pain during sex
Your periods become much heavier or more painful
You have trouble finding the strings when you usually can
Your partner can feel the IUD during sex
You have signs of pregnancy
You have severe pain, heavy bleeding, fever, or foul-smelling discharge
You should use backup contraception and contact a healthcare provider if you think it moved