A 21-year-old woman has unprotected intercourse 48 hours ago and presents requesting emergency contraception. She has regular cycles and is mid-cycle. She takes no regular medication. What is the most effective method of emergency contraception?ALevonorgestrel 1.5 mg oral tabletBUlipristal acetate 30 mg oral tabletCCopper intrauterine device inserted within 5 days of unprotected intercourseDHigh-dose combined oral contraceptive taken for 5 daysENo emergency contraception needed if unprotected sex occurred only onceCheck my answer