When to make the decision ?

Does anyone try to make sure their life is completely all set and where they want it to be when ttc? Or do you just go for it and know that everything will work out? My boyfriend and I would love to have a baby but definetly want to have more of our lives together to make it easier on a child. We also want to be married before hand. What are your opinions? Honestly the thought of getting pregnant on purpose with someone you're in love with is the best feeling in the world! And I hope that when the time is right for me everything works out :)