The answer is: She was a virgin

Matt 1:23 - Matthew clearly understands this to be a literal virgin (cf Luke 1:34) and implies that the conception was miraculous.

The virgin birth of Jesus is a fascinating topic, sparking much debate and wonder throughout history. In Matthew 1:23, we see a beautiful prophecy from Isaiah fulfilled, which states, "The virgin will conceive and give birth to a son, and they will call him Immanuel," meaning "God with us." This emphasizes the divine nature of Jesus right from the beginning of the Gospel narratives.

Interestingly, the Hebrew word used in Isaiah can mean "young woman" but many believe the Greek translation interpreted it to signify a miracle. This has inspired various interpretations throughout the ages, some viewing it as a literal event while others see it as a symbolic birth that emphasizes Jesus' significance.

Mary herself was no ordinary teenager. Tradition suggests she was likely around 14 or 15 years old when the angel Gabriel greeted her. An obscure yet inspiring element is her unwavering faith. Even when faced with the astonishing news that she would become the mother of Jesus, she responds with, "I am the Lord's servant" (Luke 1:38), showcasing her remarkable faith and commitment.

Furthermore, cherishing Mary's virginal conception opens up deeper theological reflections. This miraculous event suits the profound message that Jesus embodies—a connection between the human experience and the divine, helping us ponder the meaningful gifts our traditions offer, highlighting hope and the promise of delivering a new reality to the world. Ultimately, this account calls for a heart inclined to find the miraculous in the mundane. Who doesn’t enjoy a sprinkle of divine mystery now and then?