A woman can get pregnant if a mans sperm reaches one of her eggs (ova). Contraception tries to stop this happening by keeping the egg and sperm apart or by stopping egg production. One method of contraception is the IUS, or intrauterine system (sometimes called the hormonal coil).
An IUS is a small, T-shaped plastic device that is inserted into your womb (uterus) by a specially trained doctor or nurse.
The IUS releases a progestogen hormone into the womb. This thickens the mucus from your cervix, making it difficult for sperm to move through and reach an egg. It also thins the womb lining so that it's less likely to accept a fertilised egg. It may also stop ovulation (the release of an egg) in some women.
The IUS is a long-acting reversible contraceptive (LARC) method. It works for five years, so you don't have to think about contraception every day or each time you have sex.