I think we all at times have these thoughts. I have a 4yo bio son, and he was an easy conception. Trying again though we went through Clomid, IUI and were about ready to start in-vitro when I decided there were too many children w/o forever families to go to such extreme lengths to bring another child into the world. (my mom and sister both have had breast cancer - so I was very hesitant to introduce all of the hormones into my body that are required for in-vitro!!)
I lost one referral and lets just say this one is not in the least bit going smoothly and often think about how I could have been in control of my own destiny by pursuing in-vitro, but I think adoption is my destiny!!! Maybe I will learn to give up some control issues I have and learn some patience
Best of luck to you, whether the choice was up to you or not - you have made a wonderful decision!