I do believe but not sure that in order for it to be concealed it has to be intentional. Personally every couple of mins I run my hands palm towards my sides between me and my weapon/magazines to make sure my shirt is clear.
I will read the law and edit if I can cite.
*edit* I could not find anything in the PC to cite. I would just suggest using your SA to monitor the situation of your firearm. Whenever I am Carrying I am constantly monitoring my weapon by either the above action or simply feeling it with my elbow.