I would not worry about it! Just as others have stated, continue to follow the break-in driving procedures (limited RPM, etc etc etc). If I remember correctly, the BMW manual even confirms that it is safe to go past 1,200 miles before the service. I wish I could remember what pages this information was on, but if you have the digital copy of the manual (can get from BMW web site) you might be able to do a search for it.
I think the most important thing here is to ENJOY YOUR NEW M!