If you know the school generally sends out offers before or around now and it has been >6 weeks since the application deadline, it might be worth emailing them to ask.
I did that yesterday, and got told by one school that they were still processing due to a larger than usual applicant pool this year, was told I was wait-listed by another, and Boston hasn't replied me yet.
You might well be on some kind of wait-list or the school might just be slow...