If your eating eggs, brown rice, flax, oats, tuna or any other fish and chicken breast of course all of that contains iron... Flax and oats contain a pretty good amount... Your protein shakes contain more iron and your multivitamin if your taking one probably contains a great amount of iron as well!
I would recommend you track your iron DV percentage on a calorie counting application so you'll know just how much your taking in! It won't factor in the test of course but if your taking in well over 115% or more a day then I would recommend trying to minimize that!