Plan B

Does the fact that I insist on having a "plan B" mean that I don't trust God? 

I don't mean "plan B" as in the morning after pill. I mean "plan B" as in having a fallback plan for when life doesn't turn out the way that I hope that it will.

Where should my faith be met with practicality? And, how far should I expect faith to carry me before I trust my feet to greet the path in front of me?