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Plan B: Myth Versus Fact 1) Is Plan B a contraceptive or an abortifacient?The truth is, no one knows for sure but it probably does work by causing early abortion at least part of the time. The 2010 Physician’s Desk Reference notes that Plan B “may inhibit implantation by altering the endometrium.” In addition, Croxatto et al noted that Plan B only fully stops ovulation 12% of the time