The thing with having a Plan B, is that if you are serious, then you also need a plan C, D, E, F, and so on.
You are also telling yourself that you don’t think your plan A will work, hence the other options.
Wouldn’t it be far better to stick with the plan, and have an if this, then that contingency?
That way, you have the plan set, and know how to respond if those maybes pop up.