Listen.
Back when I was a wee lad applying for college, I knew the application was due on the 31st. Being the responsible young chap I was, I decided to submit my application a few weeks in advance. I go to submit it, and what do I discover? The application was due on the 1st, not the 31st, and I'd missed it by just a few days.
I immediately called up the school and tried to explain the situation, but they were having none of it. I was upset at myself, at the school, at life in general. But that's life.
But now I'm currently in Hollywood working as a vfx artist on a pretty big project, and it's entirely thanks to that stupid mistake forcing me to attend my second choice school. Don't worry so much. You never know how things will work out.