Hi Liz,
Just so I'm clear.....you BF and have eliminated dairy and soy from your diet? And you want to see if there are any issues with gluten?
Are you eating wheat now?
If you are eating wheat now, I would just start out with a very low ingredient wheat product, like pasta, or even make your own bread. Introduce it the same way you introduce other solids......a little taste in the morning, keep an eye out for any reactions, and continue from there.
((hugs))). It is hard to nail down these types of things. Good luck, and let us know how it goes!