Congrats on your pregnancy!
I flared both pregnancies. It affected both 1st trimesters with bleeding and I had alot of other complications because of the crohn's, but both children were born and remain healthy (Thank God). I was on prednisone and pentasa, probiotics, dig. enzymes, vitamins, etc.
There are many women who flare while pregnant and have healthy babies. There are risks but there are steps you can take to minimize the risks by following your doctors advice and sticking to a healthy diet that hopefully won't exasperate your symptoms.
I highly suggest you change your diet to one that is free of sugar and processed food (if you haven't already), and take digestive enzymes but check with your doctor or pharmacist to make sure the digestive enzymes are safe during pregnancy.
I hope you'll have a healthy pregnancy and baby!