i would do what the manual states first and then if it happens again you can then be concerned, other than that i've found it normal across all the new cars i've bought to use up a bit of coolant, but after filling them back up to recommended levels they all balanced out afterwards and never lost any coolant. i would say as long as you are not seeing any puddles of coolant on the ground that you are fine.I've put about 12.5k miles on this note.
I was checking the coolant level, and it is very slowly going down.
When new it was right between the min/max marks, now it's about 1 inch above the min mark.
Do I need to be concerned?