Matthew 1:18-25 from the CEV:
This is how Jesus Christ was born.
A young woman named Mary was engaged to Joseph from King David’s family. But before they were married, she learned that she was going to have a baby by God’s Holy Spirit.
Joseph was a good man and did not want to embarrass Mary in front of everyone. So he decided to quietly call off the wedding.
While Joseph was thinking about this, an angel from the Lord came to him in a dream. The angel said, “Joseph, the baby that Mary will have is from the Holy Spirit. Go ahead and marry her. Then after her baby is born, name him Jesus, because he will save his people from their sins.”
So the Lord’s promise came true, just as the prophet had said, “A virgin will have a baby boy, and he will be called Immanuel,” which means “God is with us.”
After Joseph woke up, he and Mary were soon married, just as the Lord’s angel had told him to do. But they did not sleep together before her baby was born. Then Joseph named him Jesus.
there seems to be two “hows” to answer here.
how # 1) its a miracle.
god simply impregnated a virgin, plain and simple. lots of people seem to think this is hugely important, and that one of the reasons jesus could live a sinless life was because he didn’t have a human father. i see no support for that in the bible.
how # 2) the mechanics
did he plant a sperm in there?
did he plant many sperms in there? (and did he choose which one won the race?)
was one of her eggs even used?
or, did god plant an entire embryo?
what i’m interested in is joeseph’s character: man, that dood waited months, and months, after he got married?