In the UK, UID's are popular, but have seen a decline in use over recent years in favour of the UIS (intrauterine systems), a.k.a. the " Mirena ", which is reportedly used by about 5% of women visiting sexual health services. Both IUDs and IUSs are particularly popular among women over 45.Right now, there are three types of IUDs on the market — with a fourth on its way. The copper IUD, or ParaGard IUD, is the only form of temporary birth control that doesn’t use hormones, and it lasts up to 12 years. “The copper itself causes some of the inflammatory spermicidal response that prevents the sperm from being able to fertilise the egg,” Dr. Cullins says, and the lack of hormones means you won’t have to worry about mood swings, weight gain, or other hormonal side effects. The downside? “It will often result in periods that are a little heavier and may have a little more crampiness.”Meanwhile, hormonal IUSs release low doses of progestin — much lower than what might be in the birth control pill — and no oestrogen at all. The Mirena lasts for five years, with doses that can lighten or stop your periods altogether. Skyla and Liletta are both smaller versions that last for three years. “These last two may be better tolerated by a young woman who has never been pregnant, but Mirena and ParaGard can also be options for women who haven’t been pregnant,” Dr. Cullins says.So, how do you choose the right IUD for you? “You have to think about how long you would want to use it, whether or not you are having problems with heavy bleeding during your period, whether or not you’ll be okay with not having a period over time,” Dr. Cullins says. But, it’s also important to talk to your provider and see what he or she has experience with. “The insertion technique is a little different for each of these options, so they need to be trained or experienced with the one that you want,” Dr. Cullins adds.Ahead, nine women (two with a copper IUD, seven with hormonal IUSs) divulge what it was like to get it inserted — and whether the IUD worked for them.