Hi Lilmiss,
I'm glad to hear your pregnancy is going well!
I've been on Imuran since my diagnosis in 2000. It's been an amazing drug for me. Life saving actually. I had no side effects at all. Some people experience stomach upset, mild hair loss. But those go away once the body is used to the medication.
I have nothing bad to say about it at all. You will have to watch your liver enzymes. They'll go up. So don't be alarmed. Nothing to worry about, it's just the way the drug is metabolized in the body. My liver enzymes are totally normal right now, so it all depends on what your body is doing.
What is your dose? I take 50mg twice a day. I hope you have as good an experience with it as I do!