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...from the "Where Peter Is" article I presented...complete with references to that document..
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During the papacy of Saint John Paul II, the Magisterium began to insist that we consider personhood as if it begins at the moment of conception, however. In Evangelium Vitae, John Paul taught this forcefully: “The human being is to be respected and treated as a person from the moment of conception; and therefore from that same moment his rights as a person must be recognized, among which in the first place is the inviolable right of every innocent human being to life” (60). A few years earlier, the CDF produced a document, Donum Vitae (“Instruction on respect for human life”), which made a similar point: “The human being must be respected – as a person – from the very first instant of his existence” (5.I.1).

Note however, that both the encyclical and the instruction call for the child in the womb “to be respected” as a person from the moment of conception, without definitively teaching that the embryo is a person. Donum Vitae mentions the personhood debate later in the section, stating, “This Congregation is aware of the current debates concerning the beginning of human life, concerning the individuality of the human being and concerning the identity of the human person.” Donum Vitae then quotes from the 1974 CDF document and adds the conclusion, “The Magisterium has not expressly committed itself to an affirmation of a philosophical nature, but it constantly reaffirms the moral condemnation of any kind of procured abortion. This teaching has not been changed and is unchangeable.”

In 2008, this point was again reiterated by the CDF, then led by Cardinal William Levada under Pope Benedict XVI. In the document Dignitas Personae, the Congregation stated, “If Donum vitae, in order to avoid a statement of an explicitly philosophical nature, did not define the embryo as a person, it nonetheless did indicate that there is an intrinsic connection between the ontological dimension and the specific value of every human life” (5).

What does all of this mean? Well, for one thing, it is clear that the Magisterium has acknowledged on multiple occasions that there is a debate about personhood. It is also clear that the Church has not always considered the life of a human person to begin at conception, nor has the Church definitively taught this. That said, the Church has always regarded abortion to be evil from the moment of conception. More recently, the Church has pushed back against the idea that “delayed personhood” is relevant to its position on the sanctity of human life from the moment of conception. It has taught instead that life, from the moment of conception should be treated and respected as a human person. And in this, Pope Francis has always been in line with Catholic Tradition.
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As with the "Just Wars" issue, the Magesterium leaves room for "Prudential Judgement" of 'nuanced' situations...like forced or coerced pregnancies on women who never wanted them.