Chances of pregnancy: Emergency contraception or morning after pill is most effective when taken as directed as soon as possible, but usually up to 72hrs after unprotected sex. Check out http://www.webmd.com/sex/birth-control/plan-b where its stated up to 95% effective at preventing pregnancy if taken less than 24hrs later and even 89% effective if taken within 72hrs.
Answered 3/24/2016
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