I was in remission before my pregnancy, but starting flaring at 6 weeks. I am on Asacol and Imuran already. They added Canasa suppositories and that has mostly calmed it down (although not completely).
It's scary to be on drugs when you're pregnant -- Imuran is a class D, so I'm terrified all the time. But your baby needs you to be healthy more than anything.
It's possible your flare may calm down in a few weeks -- my doctor puzzled over my flare because he swore that most women get better rather than worse during pregnancy.