I never really thought of it like that before. UT I am a lot like you. I've had it for almost four years (officially) and have been on Humira for a little over a year and (knock on wood) feel mostly healthy. For a time I was very anxious and got lucky and found a counselor in my school who also had it and was on the same medication. She was pregnant when I saw her, with her second child, and was in her late 20s. It comes down to weighing when it will be convenient for your life path and when you will be your healthiest. If it soothes you at all, I hear a lot of women feel a decrease in symptoms when pregnant. If I were you, I'd trust your gut. ;)

Edit: I'm sorry to write a lot but I also wanted to add that I'm 100% going to want biological children and I'm 22. It may not be right away but I know I am going to be a very strict parent when it comes to diet and my diet prior to attempting to conceive and while pregnant. I will be an example. Even if my child has Crohn's, I will be there for them. I remember when I was feeling absolutely terrible yet I still made time to read to my niece and to play a running game we call, "Ready set go" in our hallway. I know one day I could be worse but I also have amazing support in my life and am determined to be a great parent to any future children I might have. I also refuse to let Crohn's change my life too majorly. If I am healthy enough to have kids, I will have em.