• Preventing ovulation
• Possibly preventing fertilization by altering tubal transport of sperm and/or egg
• Altering the endometrium, which may inhibit implantation

Judie cites the human embryology textbook The Developing Human: Clinically Oriented Embryology, 6th Edition, by Moore and Persaud (page 532), to explain why the above mechanisms categorize Plan B One-Step as a potential abortifacient:

Ovarian hormones (estrogen) taken in large doses within 72 hours after sexual intercourse usually prevent implantation of the blastocyst, probably by altering tubal motility, interfering with corpus luteum function, or causing abnormal changes in the endometrium.
These hormones prevent implantation, not fertilization. Consequently, they should not be called contraceptive pills. Conception occurs but the blastocyst does not implant. It would be more appropriate to call them “contra-implantation pills.” Because the term abortion refers to a premature stoppage of a pregnancy, the term abortion could be applied to such an early termination of pregnancy.

Yes, Roe v. Wade dramatically changed American society in the following ways, among others:

• Over 40 million unborn children have died from legal abortion;
• statistics suggest that the number of careless conceptions have increased, because many women treat abortion as a form of birth control;
• studies indicate that there are increased rates of sexually transmitted disease; it is difficult to protect minors from statutory rape in states where there are no parental involvement laws, because some clinics encourage underage girls to lie about their ages, or refuse to report suspected rape;
• the role of the father has been devalued, because men have no say in whether their children are or are not born;
• out-of-wedlock births are up – arguably many men do not feel responsible for the children they unexpectedly father because they view the decision of whether or not to have a child as solely a woman’s decision;
• there is an increased use of prenatal testing to discover genetic conditions, followed by pressure for women to abort children with genetic abnormalities;
• there are now “wrongful birth” and “wrongful life” lawsuits;
• it is challenging to regulate abortion clinics, and thus protect women’s health, because abortion proponents challenge the regulations in court;
• there are huge contradictions in the law, where “wanted” unborn children are protected but “unwanted” unborn children are not;
• employers generally feel less obligated to provide flexible work schedules and childcare options for their employees, and some even pressure employees to abort;
• countless women are suffering from the medical side effects of abortion – breast cancer, depression, placenta previa, preterm birth, suicide, and more, and there has been a general devaluing of human life.

[Photo attribution (Sotomayor): cleveland.com]