The deadly period

I was looking at a file that contained my statement of purpose for PhD applications, and it looks like the copy that I sent to at least two schools contained a sentence that had two periods at the end of it, not one. So, being the obsessive worrywart that I am, I'm panicked that this slip in proofreading could be the thing that kills my chance at getting in to these schools. Ugh. Years of schooling and now a stray period may do me in. What a world.