Congrats on your pregnancy! I had my jpouch surgery 21 years ago, and am currently 26 week pregnant as well!
My pregnancy has been pretty normal without too many rough symptoms. However, I feel like my butt has been more sensitive to what I eat. Anything spicy I can definitely feel it big time when I go to the bathroom. I've been avoiding eating spicy food, and anything that's high fiber (apples, whole grains, popcorn, nuts) since that seem to really aggravate my butt.
My ob thinks it shouldn't be a problem to have a vaginal delivery, but we'll continue to assess as I move along with my pregnancy. This is my first baby too, so I don't have any firsthand experience, but I've read about other women who have jpouch and had normal vaginal delivery and recovery. Plus, we want to have at least two kids, so I'd want to avoid having too much scar tissue from having additional surgery if possible.
Wish you a healthy pregnancy and smooth delivery!