Although my oil level hardly dropped before my first oil change, it is not abnormal for the engine to burn a little oil during the break-in period while the piston rings are setting in.
Carefully top it off (do not overfill) and keep an eye on the oil level. Oil consumption should stabilize after about 5,000 Kms.
By the way, is yours a manual transmisson/ Do you downshift a lot?
Since your car is still under warranty, you might want to at least report your observations to the selling dealer.
Keep us posted.
