[xzins]

A woman is most certainly a mother prior to the birth. See the underlined.

Luke 1: 41 When Elizabeth heard Mary's greeting, the baby leaped in her womb, and Elizabeth was filled with the Holy Spirit. 42 In a loud voice she exclaimed: "Blessed are you among women, and blessed is the child you will bear! 43 But why am I so favored, that the mother of my Lord should come to me? 44 As soon as the sound of your greeting reached my ears, the baby in my womb leaped for joy. 45 Blessed is she who has believed that what the Lord has said to her will be accomplished!" 46 And Mary said: "My soul glorifies the Lord 47 and my spirit rejoices in God my Savior,

[Wolfstar]

A woman is most certainly a mother prior to the birth. See the underlined.

She was a mother-to-be at the time, not yet a mother. The passage you underlined is meant in the future sense, as made clear by the passage immediately preceding it, "the child you will bear."