I have the Mirena IUD currently. And I have to say, I adore it. It, I believe, does include a small hormone dose. However, it's miniscule, and released over five years while you have it in, so it's not going to wreak the same sort of havoc the Pill or the shot would. It hurt like ever-living hell to have put in, in all fairness I feel I should warn you. I took some insane amount of ibuprofen a half hour before at the suggestion of the doctor, and it still blazed with white-hot pain during the insertion. Afterward, it settled itself comfortably, and now it's fine. I've had it for over a year now, and I still don't have to do squat for birth control until 2011. I love that. I occasionally get cramping from it, usually when I have a full bladder because it puts pressure in the wrong direction or something, but it never lasts long. So - initial investment of massive agony, but five years of peace of mind. Yeah, I'd take that trade-off any day.
The infertility worry comes when you have sex with a partner who has an STI. The IUD increases your odds of an STI causing infertility, which is why they recommend it only for women in a monogamous relationship or who are very very careful about all partners getting tested regularly. So, if you're sure you and your partner(s) are all clean, infertility shouldn't be an issue.
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