Would your doc consider putting you on Imuran and Remicade at the same time? When Imuran alone wasn't doing it for me, my GI added Remicade. The studies showing increased risk with the combo only seem to apply in adolescents. I don't know about pregnancy, though.
What about increasing the dose and/or frequency of your Remicade? You've only been on it for 3 months. I know that it helped me at first, but it didn't really make a lasting difference until about 5 months or so. Unless things are really unlivable, I'd try to hang in there a little longer. It will take a couple months for the Imuran to reach theraputic levels in your system, anyway.