Oh this is something I think about a lot. I don't know how I could face going through this every time we decide to have a child!!
We'd ideally like 3, but at the rate we're going, I'll be 70 before I have my first so 3 definately won't happen!
Once I recover from having the first (if I ever have one), I think we'll probably try again straight away. That way, we can get this terrible part of our lives of waiting, wondering, trying and being disappointed, over with and get on with being happy.
But then again, who knows.....