Britney Spears says she has an IUD implanted. Experts explain how they work

After 13 years of living under a conservatorship, pop star Britney Spears finally spoke in court Wednesday. Among the explosive details, Spears said that she's not allowed to have her IUD removed — something she wants to do so that she can try to have a child. What is an IUD and what, exactly, does it do? Ob-gyns break it down.

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