If it has only done it the one time, I wouldn't worry about it at all. You don't appear to be using any significant quantity of oil. The biggest concern is that you left it idling for seven minutes. Since you were at home and hadn't left yet, I am assuming it was cold then, and that is hard on your engine. Start it up and drive it as soon as you have oil pressure, in just a few seconds.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue