Congratulations! I remember when you posted originally, asking about getting pregnant with AIH and on Imuran. I believe you had an answer from someone here at that time, though I don't recall exactly what she said. However, I did find this information at RxList.com:
Pregnancy: Pregnancy Category D. IMURAN can cause fetal harm when administered to a pregnant woman. IMURAN should not be given during pregnancy without careful weighing of risk versus benefit. Whenever possible, use of IMURAN in pregnant patients should be avoided. This drug should not be used for treating rheumatoid arthritis in pregnant women.12
Given this information, I think you should discuss with your doctor whether to continue on this drug during your pregnancy. As you may know, risk is highest with any drug in the first trimester.
ETA: I found the answer from cj7 to your original post. This is what she said, and I quote:
"I became pregnant. I was scared and excited all at once. The doctors told me I had to abort. My husband and I were crushed. They could take me off the drugs through the pregnancy and my hormones would probably take care of me. Until the baby would be born. Your hormones take a nose dive after birth. That's when the scary part came, I could die after the birth because they wouldn't be able to get my drugs back in my system fast enough."
She ended up having an abortion 3 mos. into the pregnancy. This is something you should really look into more and perhaps get a 2nd opinion as to the safety of not only your baby but also yourself if you continue with this pregnancy.