I would have to agree with wagglebee on this although not the Catholic idea. The mechanics of the divine conception can't be determine. All we know is that it was not through Joseph (or anyone else for that matter) that it happened. At the same time neither was it an act of Mary. There wasn't anything more special about Mary then there was Joseph.
Mary obviously carried the Lord Jesus to full term. She went to visit Elizabeth. They had to travel to Bethlehem. Matthew and Luke both indicates there was a time delay. There was nothing magical about her womb.
HD, I agree.
Would you agree that Mary is the Mother of God?
No, for sure. God doesn't do magic tricks. Incarnation, like Resurrection, was not magic (except for Gnostics), but a miracle, and a mystery we don't understand.
Mary's womb was chosen to contain the limitless and timless God. Where God dwells on earth, in Person, is Holy of Holies, except for Protestants. I guess they are "above" that.
So the Protestant view is that any womb would have done just fine?