Margaret, I actually had the pregnancy talk with my onc yesterday. I was diagnosed with stage IIIa melanoma last month but prior to this my husband and I had wanted to start a family this year. My onc told me that I need to wait at least 3 years before trying to get pregnant (1 year of which I'll be doing treatment). He told me that it's necessary to wait to be sure there are no recurrences b/c if I were to get pregnant and the melanoma came back they wouldn't be able to do a whole lot for me until the baby was born. He was reassuring though that, once cleard, I shouldn't let melanoma stand in the way of trying to start a family. He did say that I should be closely monitored during pregnancy though.
I hope I was somewhat helpful even though I can't really speak from experience. I also pop on www.mpip.org message board, there's a lot of good info/experience on there as well. Good luck.