When to plan a pregnancy

I need advice from fellow nurses! I am a new graduate RN and am just about to be starting my new job! I have a 2 and a half year old son and am beginning to get a "baby itch" again! I started nursing school when my son was 15 weeks old. It was difficult to make it through a challenging nursing program and clinicals with a small baby. But, I made it all the way through school, without every repeating a semester. I am so proud of this accomplishment and right after May graduation, my fiance of 3 years and I got married! So, now I am about to start to work as a new RN and wondering if it would be TOO much on me right now to start trying to get pregnant? My shift will be a 4pm-12midnight M-F which I really think is a good shift for me. What do you think?? Good time, or bad?