So, you may think.
But it could be number of different possibilities.
- It could be not a prophecy at all. What you may think is a prophecy, could just be the author's do his (or her) usual meaningless rhetoric (which I think what most of the Revelation), like to show off their plays with words and with symbols.
- Or what you may think is a prophecy just maybe symbols of what had already happened in the past.
- What people called prophecy, is often subject to open and loose interpretation. For instance, how many times have people interpret passages from Revelation, and predicted the end of the world, and nothing came of it?
There are lot more possibilities, but I right now I'm tired and I can't think of them.
But to get back to your possible more-than-one-fulfillment-in-a-single prophecy. Sure, the Christians believed that 7:14 sign is about Mary (virgin) and Jesus (son, Immanuel) some 700 years after Isaiah, is one prediction.
But from the Jewish perspective and from the context of chapter 7, the sign (Isaiah 7:14-17) was actually about King of Assyria saving Jerusalem from destruction, before the boy (Immanuel), born from young woman, know the difference between right and wrong. Chapter 8 made it quite clear that the sign would happen during Isaiah's own lifetime, and that of the lifetime of King Ahaz of Judah, and not 700 years later.
No where in the sign, that if you read the whole sign (again, Isaiah 7:14-17), predict the coming of a messiah, because the King of Assyria was supposed to fulfill the sign, unless you believe that the messiah was the King of Assyria (more precisely Emperor Tiglath-Pileser III (reign 745727 BCE). And the 1st part of the sign doesn't mean the young woman would give virgin birth to a messiah (that's Matthew's interpretation).
When you read all of chapter 7 and 8 of the book of Isaiah, and that of 2 Kings 15:29 and 2 Kings 16:5-10, you will understand the sign of Isaiah 7:14-17 bear no relation to Mary, Jesus or the messiah, and nothing to do with virgin or virgin birth.
So Matthew's interpretation in Matthew 1:22-23 is wrong.
Sincerly blindly followed whatever Matthew say. I'm hoping that you're a lot smarter than him. So please read Isaiah 7 and 8 in their entirety (as well as the verses in 2 Kings 15 and 16 that I have already given), and then you would understand why Matthew's claim that Isaiah 7:14 relates to Jesus is wrong.