Always And Forever
There was never a time when God the Son was not. He has always existed in eternity as a member of the Holy Trinity: God the Father, God the Son, and God the Holy Spirit. His miraculous birth was so we might know Him.
The Virgin Birth must be accepted by faith. Surprisingly, many so-called Christian clergy deny the Virgin Birth. Take away the divine birth and Jesus is a mere man. His virgin birth, atoning death, resurrection, ascension, and return stand or fall together. If you reject any of these great teachings about Jesus, you reject them all.
1 John 5:20 And we know that the Son of God is come and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God and eternal life.