Yeah Lady, I would call.
I didn't call, and I was contacted by Margarita on Friday stating that they hadn't received my pre-med advisor letter yet. I would imagine THEY contacted ME because I have an interview coming up on Tuesday of this week! What's weird is that my advisor sent his letter a month ago. Maybe it got lost in the mail, but I think someone there may have lost it. It doesn't sound like the tightest run ship around there right now.
In any case, make sure to call and ask if they have everything. If they don't they will wait until shortly before your interview to let you know, and then it will be a stressful scramble for you to get the necessary items for your file. Think of it as 5 minutes out of your time one day for peace of mind. Good luck!