This came up during a pro-life discussion at church. Is a woman allowed to use spermicide following a rape?
Moral theologians generally agree that a woman who is raped can be given medicines and therapies that prevent fertilization. However, treatments that would kill an embryo or prevent an embryo’s implantation cannot be used because such treatments would abort an existing child.
Emergency Contraception and Treatment of Victims of Sexual Assault**
by the Secretariat for Pro-Life Activities (USCCB)