When I applied, I included that I wrote an article that was published in inChemistry magazine. When I emailed admissions offices to update my file, I included that I had a second article published in inChemistry. Both articles were for leisure reading and not research oriented. What I did worked for me and no questions ever came up in my interviews. If I were you, I would ask AMCAS by calling them or even ask admissions offices just to be sure.
Best of Luck to you!