The IUD is a small T shaped device that is inserted into a woman's uterus that helps protect against pregnancy.
There are different types of IUDs available. Some of them contain hormones and some don't. Depending on the type of IUD, pregnany can be prevented for 3-10 years. (But don't worry they are easily removed if you decide you want a baby before then.)
Since you don't have to remember to do anything with an IUD they are VERY effective at preventing pregnancy... 99.9% effective.
If you feel anything other than your IUD strings call the clinic right away.
If this happens you may not be protected from pregnancy so use a condom or don't have sex until you are seen by a doctor or clinician.
YES. The IUD does NOT protect you against STDs and/or HIV. You should still use a condom for protection against these.