I had my first flare with UC when I was 32 weeks pregnant w/ baby #2. At the time I didn't even know I had UC-got my first colonoscopy and diagnosis 3 days after the baby was born at 35 weeks.
Anyhow, I have been doing a LOT of research on pregnancy and UC, as I'd love to have another child but am terrified of flaring again like that-I really truly almost lost the baby and was so, so sick... I'm at work and don't have access to any of the research I've found, but will do my best to find it later today or tomorrow, but here's what I have learned, from OB's, from internists, and from GI's, plus from my own research:
-your UC has no bearing on your ability to conceive, provided you're in remission.
-women who are in remission at the time of conception are likely to stay in remission throughout pregnancy.
-women who are in mild flares at the time of conception are more likely to flare during preg.
-even if you flared first when preg, you're not likely to flare again if in remission at time of conception.
-it is MUCH, MUCH safer for you to be on ALL mts meds (imuran, remi, etc) during preg than to risk a flare when pregnant.
-It's recommended that you be in remission for 3-6 months prior to conception.
Moral of the story: a UC flare is the most dangerous thing to your baby when pregnant. Much more dangerous than any of the maintenence meds are.
I truly wish you the best of luck here, I'm in the same boat with hoping for another pregnancy some time this year or next. I know you want what is very best for your baby and your health and will make the right choice!
Sorry for the long post!