Mom's health directly impacts the health of her developing fetus. If your IBD is flaring, you're rapidly loosing weight, and you're malnurished then you can deliver your child much earlier than is typical. I'd encourage you to stabilize your IBD with asacol or an appropriate medication recommended by your gasteroenterologist. Asacol is a 90 percent topical medication and many moms have delivered happy and healthy babies while on it.
From conception to delivery: Managing the pregnant inflammatory bowel disease patient
www.ncbi.nlm.nih.gov/pmc/articles/PMC3974516/The Second European Evidenced-Based Consensus on Reproduction and Pregnancy in Inflammatory Bowel Disease
ecco-jcc.oxfordjournals.org/content/eccojc/9/2/107.full.pdf