I usually look here: http://www.glutenfreedrugs.com/
any time I am getting prescription or non-prescription drugs.
I have found a couple that I feel safe with, and another that I called about but they didn't give me a warm fuzzy feeling. I have used Junel Fe, and Microgestin with no issues. The one that I called and wasn't sure of began with a "G", but I don't have the label in front of me to say if it was the brand you are using or not. I can't say that they have gluten in them, but I'd rather be safe than sorry.
My pharmacy has been really good with the gluten-free stuff, and has always gotten me one of the two that I listed above.