There is no miraculous prophetic significance in a “young woman” bearing a son named Emmanuel. The word “almah” does mean “maiden”, hence “virgin”. The word that would denote an unmarried young woman who was not a virgin would be “zanah”.
The other Hebrew word “bathulah” has the literal meaning of “virgin daughter”.
What’s the point in mentioning the mother and the conception if there wasn’t something extraordinary about it? History books talk about Abraham Lincoln being born in 1809. No mention of his mother conceiving and giving birth to him, because that goes without saying. Focusing on a historical hero’s conception by definition implies it was out of the ordinary
Pax tecum.