lj268 - i am sure that there is another thread on the deap heat (several, i started one ages ago, but, i think there is a newer one in the 3rd tri section) anyway it was decided that its not good to use during pregnancy. even thou it doesnt mention it on the box, i think few peoples have researched it, and ask their various care providers, who have said to avoid it.
I use it on my DH at times on his back occasionally, but always wash my hands immediatly afterwards.