I had many conversations with my GI prior to conceiving and he told me that the data shows that Humira does not increase your chances of miscarriage or there being something wrong with your baby any more than the general population. He said it was important for me to be healthy and if that means being on Humira while pregnant, then that's what I had to do.
I hate that I'm taking these drugs (also on Imuran) while pregnant. But I flared so badly with my first pregnancy that I was thisclose to losing the baby due to malnutrition (not the drugs). So this time, I'm doing everything I can to stay healthy/symptom-free.