If you drove it after filling it in, then you are good. It shouldn't drop at all. Well maybe a little, but I doubt it very seriously that it will ask you to add more. You should be fine for a while. How often do you have to add oil? I usually have to add at around 3-5k miles. It also depends on how hard I push her.
'09 E92 ///M3 Interlagos Blue, 6MT
, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy/ '11 E90 328i
Black Saphire Metallic, Premium Package, Technology Package - Daily Driver '02 Nissan Xterra- Daily Driver/ '04 Yamaha R1
-Toy/ '06 Yamaha Raptor 350