Scripture is written to the point in its largely story form, surely partly so we can fill in the gaps in seeing how our various stories fit into the one great Story of God (as Eugene Peterson points out). When we read of Mary and Joseph we read of a narrative with gaps in which there surely was some times of more than ordinary stress for the two.
There is the time after Mary received word from the angel of the miraculous conception and special baby she was to carry. How would this work out? Would Joseph believe her? There is Joseph, struggling through this until God assures him in a dream through an angel that Mary is indeed telling him the truth, amazing as that truth is. Then there is the aftermath, in which Joseph and Mary together surely had to live among whisperers and people who knew that she was pregnant, though they had yet to come together to live fully as husband and wife. A time of stress.
Then Jesus is born. Stress surrounds this of course, but more than from the normal process of birth. There is the king Herod from whom they end up having to flee and then live in a foreign land: Egypt. And then upon their return Joseph is uneasy and is directed by the angel to leave Judea and they go back to Nazareth.
Stress. A normal part of human life and at times especially acute. It's good that we have the story laid out as we do. We can see God's hand in it all throughout, though in the actual living out of it Mary and Joseph could not always see that, and surely they had questions along the way. But in our reading of it we see it turns out for good, though not in the way we would come up with ourselves. Simeon made it clear to Mary that her path would not be an easy one since a sword would pierce her soul too, with reference to her son and his mission from God.
Jesus himself shared in this stress. We can see it sometimes in his interaction with people during his time of ministry, and acutely so in Gethsemane. He knows firsthand and with that empathy is God-with-us, Emmanuel, to help us in the times of stress we face.
Let's thank and praise God who has come to live in the person of his Son, in this real world and experience. Completely human just as we are, yet also "God-with-us", present to help us through to the glorious end.