So sad, but such a beautiful song

I watched this video for the first time at Anna's blog. So sad. As I'm getting married soon, I think about children often. I love children. I still dream of having many. But sometimes I wonder - what if I will not be able to conceive? What if there will be no children? How will I handle it if we have to wait for a long time. I have several dear friends who had to wait a long time or are still waiting. It can be so heart-wrenching.
No matter what God's plan is for me, I know I want to act in a sensitive way around young married couples who have not had children yet. Who knows their story?