The emergency contraceptive pill sold as Plan B One-Step does not prevent a fertilized egg from implanting in the womb and does not cause an abortion, the US Food and Drug Administration said Friday.Previously, the product label had said the pill might prevent a fertilized egg from implanting.Instead, the pill, which is a strong dose of the birth control hormone levonorgestrel, prevents or delays the release of an egg from a woman’s ovary – a step that occurs well before pregnancy.The FDA says it made the labeling change after Plan B’s manufacturer requested it and after completing a scientific review.Demand for emergency contraceptives, including Plan B, surged earlier this year after the Supreme Court’s decision to overturn Roe v. Wade removed the federal constitutional right to abortion."