I nursed my second eldest daughter while pregnant with my third daughter and was much like you, only the 1-2 feeds a day - if I remember (they are 18 and 16 now - seems like yesterday though) I did this for about 3 months. Hard to tell if It hurt me as I was always tired anyway, but CD wise I always thought pregnancy and nursing kept me in remission.
Good luck and congratulations on your pregnancy - may it be a healthy and happy one.
Current meds: Methotrexate, Prednisone, Humira
Bowel Resection Sept. 07