Can my girl friend take emergency contraception 3 days later?

Yes: Plan b - the emergency contraception pill - is indicated for use up to 72 hours after unprotected sex. It is more effective the earlier it is taken. If she is a little out of the window, it is still safe to take. She should take a pregnancy test if her period is more than 2 wks late. And, i would recommend she see her ob/gyn about reliable contraception.

Yes: Ella (ulipristal acetate) works up to 5 days after sex . Other options best asap but up to 3 days. They work by preventing ovulation, and are not perfect. Regular ongoing birth control works better. Pills, patches, ring are options, but require regular use. Consider long acting options of iud and implant. They're the most effective and easy!