A new study shows that a copper intrauterine device (IUD) was 100% effective in preventing pregnancy as a form of emergency contraception in 2,000 Chinese women. The IUD was implanted in the women up to five days after they had unprotected sex, and it prevented pregnancy in all women who followed up with doctors (all but 70 of the original 2,000). These findings suggest that the rate of pregnancy while using the IUD as emergency contraception could be even less than 1 in 1,000, while the rate of pregnancy with Plan B (the “morning after pill”) is 1 in 100.
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