I did not take Imuran while pg, but did take Remicade. My docs recently wanted to put me on Imuran and we are not done having children, so we sought a 2nd and 3rd opinion on the drug. Long story short, I'm not on Imuran, but it has NOTHING to do with the pregnancy issue. In fact, they have not found any greater birth defects with Imuran, so you should be fine.
Keep in mind, it is better for you and baby to stay on your current drug regimen. If you flare while pg, it can be harmful to both you and your baby. I would definitely get on a regular schedule with your GI. I saw mine every 6 weeks while pregnant just to ensure I had no problems.
I"m sure your little one will be fine, but I most certainly understand the anxiety involved!
Kaycie - Age: 26
Crohn's - Dx Nov 05
Remicade - Next infusion - July 10th - new dose - 10mg/kg
IVF #1 (In-Vitro Fertilization) - Failed
IVF #2 - IVIg, Heparin, Baby Aspirin - TWIN GIRLS!!!
Reagan Dawn - 8/2/07 - Lived 1 hour 27 minutes due to Cloaca, NOT affiliated with my Crohn's
Addison Maria - 8/2/07 - 11 months old