i would look and feel all the lines and connections you can get to on the ac system, and look at the compressor housing for signs of oil. If everything is dry, and if you use a black light AC leak detector light and see no signs of dye then you can be pretty sure you've lost no oil. a common point of leakage is at the high and low service ports. if they have schrader valves, then get the tool and unscrew them half a turn then reseat. this will sometimes stop or greatly help the leak there at that o-ring.
spend $50 on a set of AC gauges from harbor freight, and add r134-a.
my altima ac would leak in about a months time to where the compressor would cycle on and off because of the low pressure sensor tripping. my leak was only at the high and low service port valves. and when you undo the plastic caps covering those valves, if you hear a little pppft then it is definitely seeping there. many times you can feel it when undoing the plastic cap.
and you said new car... new as in 2014 that's under dealer warranty or just new to you? don't tell the dealer you did anything to the AC if it's "new" car.