I am a student here at U of M Med School, and I feel the need to reassure some of you.
Just because you haven't been accepted yet does NOT in any way mean that you won't be accepted. Your pre-med advisors, your interviewers, your friends in med school have all told you that this med school admissions process is a long strange trip, and they are all correct. The only absolutely certain thing about this process is that nothing is for certain!
I am not exaggerating when I say that MOST of my friends here were once worried like you because it was late in the winter or spring when they were accepted here, or they were accepted off the wait list in the summer.
To those of you for whom U-M is your definite #1 choice: good choice, it's awesome here. Now write a letter to Katie Horne (director of admissions) that indicates that if you are accepted, you guarantee that you will attend U-M. It will not hurt your chances, and it very well might help. Obviously, don't write such a letter if this isn't true - med schools talk to one another, and you might find yourself with zero acceptances on account of your lack of integrity.
Bottom line: keep a positive attitude, and stop worrying so much. I hadn't even filled out ONE secondary at this point in the year.