The Paragard (copper) IUD lowers your chances of getting pregnant by more than 99.9 percent if you get it put in within 5 days of unprotected sex. It’s the most effective kind of emergency contraception there is. And unlike morning-after pills, it works the same no matter how much you weigh.

One of the most convenient things about getting an IUD as emergency contraception is that it keeps giving you super-effective birth control for up to 12 years (or until you want it taken out). So once you get an IUD, you won’t have to think about emergency contraception again until you stop using the IUD.