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Hormonal IUDs primarily work by preventing ovulation, which means that eggs are rarely fertilized. When ovulation does occur and an egg is fertilized, the hormonal changes induced by the IUD can prevent implantation in the uterus. While it's difficult to quantify exactly how often this occurs, studies suggest that it is a very rare event, as the primary mechanism of action is to stop ovulation rather than to influence fertilized eggs. Overall, hormonal IUDs are highly effective in preventing pregnancy, with failure rates of less than 1%.

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2mo ago

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