You don’t set action by adjusting the truss-rod alone.
A new guitar ‘moves’ during the process of forgetting it’s a tree and realising it’s now a guitar
so your action-change may not be a symptom of anything ‘sinister’, it might just be an effect of the guitar ‘settling-in’.
”I would take it to the luthier but i dont live in the states and im not really sure about how much of guys around here are knowledgable about martins.”
A guitar is a guitar is a guitar, and the set-up requirements for a Martin are precisely the same as for any other guitar. When I get a brand new guitar, I give it three months or so to settle-in, then I take it to my (very good) local luthier for a proper set-up, which involves checking neck-relief and adjusting the rod if necessary, adjusting nut-slot-height and, if required, adjusting saddle-height.
You don’t say by how much your neck-relief has changed - what is your neck-relief in 0.000”s currently?
The usual disclaimers apply......IMHO, YMMV etc.