More than 99% effective. An IUD can stay in place for 5 to 10 years depending on the type but can be taken out at any time. Fewer than 1 in 100 women will get pregnant in a year, depending on the type of IUD. Older types are less effective.
If you experience pain in your lower abdomen, have a high temperature or expeirence a smelly discharge coming from your vagina, you should talk to your doctor or a health professional Immediately.
You should also ask about risk factors such as smoking, your age or medical history before you get the intrauterine device