Isaiah 7 Virgin Will Conceive a Child

Talk about strange prophecies. This prophecy is one of the strangest prophecies in the Bible based on who the prophecy was given to and circumstances surrounding the timing of the message. Imagine being the king of Judah. The city is surrounded by invaders and the Lord sends you this message. Look! The virgin will conceive a child! She will give birth to a son and will call him Immanuel (which means 'God is with us'). Of course it has to be a spiritual message. But what is it pointing to?