I have seen or heard about this happening at other universities. As @skieurope has said above, this suggests that they have not yet made up their mind, which is probably slightly good news. Of course this does not tell you anything about whether or not you will get in. I have seen a few cases where this did result in an admission decision being delayed a bit, but again this is not something to worry about.
Assuming that your counselor sent in your 1st quarter grades or will send them when available, I would not worry about it. You are likely to hear back relatively soon.
Make sure that you also have applications in to safeties, and best wishes.