A 32-year-old woman from Mumbai attends the family planning clinic requesting emergency contraception. She reports unprotected intercourse 36 hours ago. She is breastfeeding her 2-month-old infant and has no significant past medical history. Menarche was at age 12, and she has regular cycles. She is afebrile, BP 120/78 mmHg, and general examination is unremarkable. What is the most appropriate emergency contraceptive regimen for this patient?