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Published 17:00 19 Oct 2014 BST
Updated 07:32 18 Dec 2014 GMT

What are the advantages?
One advantage of the IUS coil is that you do not have to remember to take a pill every day. Therefore you don’t have to think about contraception every day or every time you have sex. It works for five years (Mirena) or three years (Jaydess) and is one of the most effective forms of contraception available.
Other advantages are that the Mirena coil is often used to treat painful or heavy periods and often, women who can’t take the Combined Pill can use this method of contraception.
What are the disadvantages?
The IUS can be somewhat uncomfortable when it is being put in. Some women may not be happy with the way that it affects their periods (see side effects below).
Also, it is extremely important to remember that the IUS does not protect against STIs, so you need to use condoms to protect yourself from this. If you contract an STI and leave it untreated while you have an IUS fitted it could lead to a pelvic infection.
What are the side-effects?
The IUS can make your periods stop altogether or they may become lighter or shorter. However, it is reported that Jaydess is less likely than Mirena to make your periods stop altogether.
Irregular bleeding and spotting can be quite common in the first six months after having it fitted, while some women have reported headaches, mood swings, skin problems or breast tenderness. There is also a small risk of getting an infection after it has been inserted.
Will it make me fat?
To date, there is no evidence to suggest that an IUS will affect your weight.
Will it increase my risk of cancer?
There is no evidence to suggest that having an IUS fitted will increase the risk of cervical cancer, cancer of the uterus or ovarian cancer. Some women may experience small changes in their mood and libido.
When can it be fitted?
The IUS can be fitted at any time during your monthly cycle – as long as you’re definitely not pregnant. Ideally, it should be fitted within seven days of the start of your period as this will protect you against pregnancy straight away.
If the IUS is fitted at any other time, you should use condoms for seven days. After fitting, if you have pain in your lower abdomen, have a high temperature or a smelly discharge you should return to your GP or clinic.Explore more on these topics: