I never thought I wanted kids. Until about 6 months before I found out that it's never going to be an option for me. Not naturally, not through adoption, not at all. Please don't overthink this situation or spend too much time "waiting". It's natural to have fears. Why not just let nature take over? If it's meant to be, it will happen. I had a friend that wanted kids but being pregnant could possibly kill her. She stopped taking her birth control and they did not try. Now she is pregnant. Do what's right for you and your family. But don't overthink it. Because if that option is EVER taken away from you, you will deeply miss what you never had. Best of luck and love to you, I feel you will be guided to make the right decision.
Hail Gunther 7-2-2013
If at first you don't succeed, destroy all evidence that you ever tried.