“Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.”
King James Version (KJV)
Mt 1:18 The birth of Jesus Christ. The word rendered here "birth" is the same in Greek that is translated "genealogy" in Mt 1:1. Mary was espoused. Not married, but engaged. Betrothal was, from the times of the patriarchs, a formal ceremony, and was regarded a binding obligation. It generally lasted a whole year before marriage. After betrothal unfaithfulness was regarded adultery. Before they came together. Before marriage. She was found. The angel (Lu 1:26,27) predicted her conception, and when the prediction was verified she probably did not hesitate to reveal it. Her heart would be filled with joyous pride instead of shame. Holy Ghost. Correctly, Holy Spirit. The Divine power. Christ is the only example of such a birth in all history. His birth, like his life and his resurrection, is a miracle.