Specialized Pitch 2017 clicks like its changed gear but hasnt
This is likely caused by your one of your derailleurs (probably rear) being very slightly out of alignment, which is not unsurprising for a new bike.  Cables tend to stretch slightly* during the break in period on the bike and they're responsible for keeping the derailleurs aligned.  This is a large part of the reason that bike shops will encourage you to bring the bike back in after the break in; it's expected that the breaks and shifters will need some tweaking at that point.

In the mean time, as long as it isn't ghost shifting and you aren't too bothered by the noise itself, I wouldn't worry myself about it.  The bike will be fine for the few days until you get the service done.

*Interestingly, "cable stretch" is a bit of a misnomer.  In fact, most of the change is caused by the cable housing compressing under load.  The end result is the same, however, and describing it as "cable strech" is more intuitive to most people.