Start the Specific Carbohydrate Diet immediately. I have done the diet a few times, quite successfully. In fact, the first time I did the diet my major symptoms disappeared within a week to 10 days. Three months into the diet I got pregnant (2 prior miscarriages) and I STAYED pregnant. Three months into being pregnant I went into remission and stopped the diet.
This link will tell you more about the book and the diet.
ALSO - you could be flaring BECAUSE you are newly pregnant. The shift in hormones can really wreck you. BUT, it probably won't last very long (fingers crossed). You also might want to consider meds. I know it's not the "best" option, but it is possible. I have 2 healthy kids and took all of my meds while pregnant. You CAN postpone the surgery if you want to, don't let them bully you into it. If YOU feel you really need it, then ok, but don't let them push you into something you don't want to do. Waiting a week or two isn't going to make a huge difference to the surgeon, so you do what's best for you!
Keep us posted and don't panic - there IS a solution!