Note: The longest-lasting EC is currently ellaOne. It lasts up to 5 days (120 hours) after unprotected sex. Check to see if your country carries ellaOne. If your country doesn't carry ellaOne, copper IUDs may also prevent pregnancy up to 5 days after unprotected sex. If none of these options are available, and it's been over 3 days since you had unprotected sex, you can still take EC, which may work up to 5 days. Note that EC pills are not 100% effective and should be taken as soon as possible.