You asked

How can the intrauterine system prevent me from falling pregnant?

The Intrauterine System, or IUS as it is also known, is a small, soft plastic device containing the hormone progestogen. It is inserted into the womb, and if you choose to use this method of contraception, then a doctor or nurse will insert it for you - it takes about five minutes.
 
The IUS works by releasing a small dose of progestogen on a daily basis. It prevents pregnancy by thickening the cervical muscles at the womb entrance. This makes it difficult for the sperm to get through. At the same time, it thins the lining of the womb, which prevents eggs from being implanted. In some cases, ovulation is stopped totally.
 
The IUS is suitable for those wanting long-term contraception, preventing worry about pregnancy on a daily basis. The intrauterine system, once inserted, can stay in place for up to five years. It can however, be removed at any time by your doctor or a nurse. After removal of the IUS, fertility returns immediately.
 
This device might suit you if you are estrogen-intolerable. Also, as it does not affect breast milk, it can be used quite safely while breastfeeding. It has a very high reliability rate, and can be used at any age.
 
Additional benefits that could be experienced are the improvement of heavy and painful periods, as well as protection against cancer of the lining of the womb. In some cases, women have reduced bleeding or none at all, which in turn, reduces the risk of becoming anemic.
 
During the first three months after insertion, there is a possibility that you may experience headaches, nausea, breast tenderness, and irregular bleeding, but this does settle down after a while.

More questions

There are some very good reasons that you would want to avoid sexual intercourse.
Your vagina will naturally shrink after delivery, as your body heals, but whether it returns to its original size, depends on a number of factors.
Your menstrual cycle usually starts towards the end of your breastfeeding phase, but how regular it is once it is back varies from woman to woman.
It is not uncommon for women to experience pain and discomfort during sex, for the first couple of months after having a baby.
The delaying effect that breastfeeding has on the return of normal menstruation has an effect on fertility and can be considered as a method of contraception – although it is not a very reliable one.
The Intrauterine System, or IUS, is an effective method of birth control that is safe to use while breastfeeding.
It is true that some women experience a drop in their sex drive while breastfeeding, however, this isn’t always the case.
The return to your normal cycle is not a hard and fast rule and it can take anything from a month to a year before your first post baby period happens.
It is entirely up to you and your husband as to when you want to start having sex after the birth of your baby. The best thing to do is to have patience and wait until your body is ready for sex after your baby is born.
As very often happens, if you are just too tired to have sex after a long day, then tell your husband. If he is understanding and clever, he will help you as much as he can. After all, you will both benefit from this.

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