Biblically, Mary was an ordinary everyday female virgin when...

Biblically, Mary was an ordinary everyday female virgin when this happened :-
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Matthew 1:18 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.
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What nuts and bolts actual process The Holy Spirit used is not stated.
Every other human conception results in the girl no longer being a virgin.
Mary remained a virgin but now pregnant with Christ.
Mary then became the mother of Christ but beyond that continued to be a normal everyday person.
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Vatican teaches that Mary (in her death) has other powers.
Show us the verses !!!!