Flawed analogies. Pregnancy is a part of the healthy, natural, and life-giving process of sexual intimacy in marriage.
Taking safety precautions, or prudence in investments is not the same thing as preventing something healthy, natural, and life-giving.
If you have a broken seat belt, or you can't see the road, or you cannot research and investment....you refrain from driving, crossing the road, or investing.
If you cannot afford kids....you refrain from getting married and having sex. End of story.
Nice straw man. The analogy is not the type of result, but that is a controllable result. My attitude is to do your best and let God handle the rest. The end of the comment I responded to was "let God decide". This attitide is an abdication of responsibility. An attitude I firmly reject.
The funny thing is that the original poster should reject your comment starting with "If you cannot afford kids". I'm thinking that the original poster would tell you that you lack faith. If having kids is God's decision, who are you to decide for God? If He gives you kids, He'll provide a way to provide.
But God doesn't provide to those that sit on their couch and wait for Him to act. God expects us to act. God expects us to control what we're able to control and not worry about the rest because we put everything we can't control into God's hands.
Your type of answer is different that the original poster. To say to someone "refrain from getting married and having sex" is a concrete action that someone can control.
However, I can't support your attitude because it seems that it leads to the idea that someone who is sterile shouldn't get married.