Hello, and sorry to have met you in this manner! But welcome to our forum. Read, read, read the articles available on this site, etc. Be as informed as you can be.
With regard to the "how will pregnancy affect the tumor/how will treatment affect pregnancy," I would be sure to consult with doctors who are especially knowledgeable about ANs, GK, etc. in your case. My doctors knew how to kill off a tumor with CK, but I'm not so sure how much experience they had with ANs.
I sure wouldn't want to let a small tumor cause major changes in my family planning, on the other hand, I think these are very reasonable questions you're asking. Also, you never quite know how well you'll recover from treatment, and what impact that might have on child raising (not trying to be too negative here - just wouldn't want to have a newborn baby to care for at the same time I was having/recovering from GK!). My recovery from the AN and CK has been quite rocky, and my life has changed considerably more over the past two years than I had bargained for. But I'm much older than you! I have a young friend who had GK for an AN, and he was back at work in a day or so, none the worse for the wear.