Congratulations!!
I was on Remicade prior to and right after I got pregnant with my son. I had no complications from the Remicade. I am one of the lucky people, my Crohn's went into remission with both of my pregnancies. It was the most wonderful time of my life, I could eat whatever I wanted with no pain and my bowel movements were normal for the first time ever!
Are you currently flaring now? The best thing you can do for yourself if get plenty of rest, stay hydrated and eat as healthy as you can. Don't stress about the pregnancy. There are meds you can safely take while you are pregnant, talk to your GI and OB/GYN.
Good luck, so happy for you!!