How do I get rid of baby fever???!! Help!

Let me first say that I love kids and I cannot wait to have them. However, I am responsible enough to know that right now is not a good time to try/ be irresponsible. I was a nanny for years and I know exactly how ehausting and unglamorous pregnancy and having an infant is. The problem is nothing "scares" me away or makes me not want a baby right now. I think it is all wonderful and such a blessing. I literally think about it all the time. My fiancé and I have been together for 6 years (engaged for 1) and I know he isn't ready and we would like to be married first but I can't get it off my mind!!! Going a little crazy here, HELP!