What do you mean by you wrote it later than your classmates? If it was just a couple days or something, it is still curved. As for the law, you always get a point or two for the law, but missing a single issues isn't gonna kill you. If it did, you'd have a whole lot more failed law students crying into their tea.
Do you have more exams coming up? If you do, I'd worry about those, if you don't I'd take a vacation from law school, by which I mean step away from the books and the people, and go do something having nothing to do with the law. Best way to relieve stress. Keep us updated on how it goes