Isaiah 7:14 refers to a young woman, NOT a virgin.
A damsel, and this particular Hebrew word is used 7 different times/places. But what distinguishes this particular scripture 'damsel' is the naming of the child .. Immanuel, which means God with us. AND it give witness to what Luke and Matthew wrote all those many years later. But this is not the only prophecy by the prophets from Moses to Malachi of the Promise to come in the flesh and then the return to take a harvest.
There is no accident that Psalms 22 foretold of the crucifixion a thousand years prior to the event and even what would happen and would be said. These things are not accidents or coincidences.