There is only one thing you can do, and that is cross that bridge when you come to it after addressing the current OCD thoughts. With OCD, we focus on the mights, the maybes, the ifs. They can consume us, and can paralyze us into not taking action. The truth is, those mights, maybes, and ifs are purely hypothetical, and you shouldn't dwell on something that is potentially pure fiction at the expense of the very real issue in front of you.
If your house is on fire, don't stop to consider what you'd do in the case of a meteor strike.