It typically becomes Plan A.
The reason why is because we focus our energy on making sure our Plan B is in place just in case Plan A fails. We are, therefore, planning on Plan A failing.
Plan B is the safe route. It’s what happens when things don’t work out, and that’s okay! There is certainly nothing wrong with having a plan B, just be careful where you focus a majority of your time and energy. Just like you become what you think about, you achieve what you spend your time doing.