Business Americans are stocking up on emergency contraception. A physician explains key differences in the options Published 2 years ago on 07/01/2022 By Drew Simpson According to a 2015 study, Ella is roughly 65% more effective at preventing pregnancy than plan B when taken up to 24 hours after unprotected sex and 42% more after 72 hours. Read More Related Topics:AbortionAmericanscontraceptionDifferencesEllaemergencyemergency contraceptionexplainskeyOptionsphysicianPlan BRoe v WadeStocking