A little over eleven years ago, I decided I didn't want my husband and I to have children. Same arguments as Robert43, especially about how scary the world is and wondering how you could ever be sure they would be okay.
Two weeks later I found out I was pregnant! God clearly had other plans for us, and am I ever glad!! We have a wonderful son, bright, funny, loving. He's in fifth grade now, and facing middle school next year. Am I scared? You bet! Do I wish it had never happened? No way! I realize now just how faithless I was in letting my fears nearly rob me (and the world!) of such a great person as my son. I hope he'll always be great. I hope he'll always follow Jesus and make the right decisions and never give his parents any grief. I more than hope -- I pray that! And we're doing our best to make sure it happens.
And as an added bonus, I'm learning how to trust. Through ordinary childhood illnesses and kidney surgery, through kindergarten and the scariness of the first day of first grade, through friend issues and long-distance moves, we're learning that God is trustworthy. And I highly suspect we'll continue to through first dates and sex education, peers using drugs and whatever other temptations come his way.
There are no guarantees. But God has promised that He will be faithful in doing His part, and whatever choices my son makes in life, be they good, bad, whatever ... he is still my son, and I will still love him and pray for him and know that he belongs to the One who created him and gave him to us.
As for the adoption question -- we considered adoption a few years ago when I thought I wanted another child but didn't want to go through pregnancy again (it was very difficult on me the first time). We talked to several people about it, but the thing that struck me most was what a counsellor friend said. He said that adoption is a calling, not for everyone (same is true of any kind of parenting, I suppose). We didn't feel led to do it. Some folks may be. God knows who's best suited for parenting, whether "naturally" or by adoption. I'm so glad he chose us for this high calling!
Blessings!
GraceDancer