If you haven't had kids or an abortion, IUDs are sort of difficult and very painful to insert, as they must dialate your cervix. There's often spotting and increases in cramping, but the hormonal based Mirena tends to help with things like that. If you have a history of severe cramps and very heavy period flow, then they don't reccomend that you use an IUD.
The experts recomend that you check its strings after each period, but other than that you don't need to worry about birth control for up to ten years, and they tend to be 99% effective in preventing pregnancy.
While I haven't had one, I know the info. ^_^
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