Have you checked the NBME website? They tend to update it frequently regarding delays in score reports. Scores are typically released on Wednesdays, both electronically (to the school) and via mail (to the examinee). Maybe you can call you school Student Affairs office after 12 noon or so and check with them.
I'd recommend checking with school tomorrow and, if they don't have anything, maybe you could contact the NBME. If you're too busy to call, I've found that they are very promt in returning emails!