Conflicted.. share your opinion?

I had a beautiful baby boy in April 2016. He is now 7 months old. This has been a long year. I have always struggled with depression. However, while being pregnant it completely dissappeared. I have never felt better than how I did when I was pregnant.

This February, my fiancé is going to basic training for logistics in the Marines, and this summer I am moving to Colorado Springs to go to college and live closer to a friend. After 13 weeks of basic training, my fiancé will come back for 10 days. I'm afraid that while he is gone I will have a depressive episode and I would feel terrible if that happened while I'm alone with my son. We have our money sorted out, everything has been pretty stable.. and I want another baby. So bad..

He says he wants to wait, because A) he wants to be around more during this pregnancy, and B) he doesn't think we are stable enough. I don't see what is unstable about our situation right now besides the fact that he will be gone... I told him my thoughts and explained I want another so bad, and he wants one too but isn't sure about the timing... share your opinions?