If this happens you can make stuffing, croutons, or bread pudding.
Be careful not to let it over ferment. If it is allowed to go too long, it will rise too much and become a soupy mess. It will not get a good rise when it bakes and resembles more of a pancake than a fluffy loaf. If this happens you can make stuffing, croutons, or bread pudding. It is not a total loss.