My original plan for classes during senior year involved taking 4 classes per quarter and graduating with honors (req. a thesis).
Soon during the middle of senior year, I got in, and was like, "heck with this thesis" and dropped honors.
At about the end of senior year, I thought, "boy, I don't like classes anymore" and dropped all but two classes.  
And you know what?  My med school was totally fine with that.  So in short, don't worry about it.