My husband and I were already considering not having any children, and this was a decision we were making regardless if I had UC or not.
However, since my recent hospitalization and bad flare, and now taking Imuran, and possiblity of surgery, I've started to ask myself if I still really wanted to have kids and pass along this gene, along with risks with the drugs, etc. Although I've lived a great life I'm not even 30 yet, and want to stay in remission as long as possible. I am more scared of getting a bad flare during or after pregnancy, losing a child, or being too sick to care for my child, or my child getting UC.
But again, my husband and I were already thinking of being a "child-free" household.
However with that said, if we decided that we did want children, we've decided adoption would be an option for us. This way, we can give a child a new home and I won't have to worry about me and UC. UC or not, children are going to have health issues at some point in their life. I think it's a decision you and your partner will have to make together.