Very pretty fish!A female Trimaculatus will have a black dot on her dorsal fin,I did not notice one on yours.
The problem with Trimacs,even though they are a beautiful specimen,is the influx of Flowerhorns.Since the arrival of the Flowerhorn craze the Trimaculatus and the Citeinellum have lost alot of their induviduality.Lately it's hard to tell a real Citrinellum or Trimaculatus,it's best to buy from reliable sources when it comes to these guys and even then you have to be careful.
Is the red throat starting to show up?