No one is conceived by human birth. Conception comes before birth.
Anyway, Mary is not divine and she is not to be treated as such. She was born in sin, and you need to go to no one but God for the proof of it.
In Luke 3, He shows that she is descended from Adam, and all of Adam's descendents are born in original sin.
She herself says in Luke 1:46:
And Mary said, My soul doth magnify the Lord, 1:47
And my spirit hath rejoiced in God my Saviour.