Is this good enough reasoning?

My husband joined the military 6 months ago and we are moving to another state soon. We already have a son. He’s pretty young. Not even a year yet. I am wanting to at least have another before my husband gets deployed. With his MOS he will be tied to an Infantry unit and it just worries me. We have obviously talked about what happens if he passes. I wont remarry or have any more kids with anyone else as long as I have at least 2 with him. I want to at least have another within the next year before he actually deploys so I can have him around for the pregnancy and afterwards a little. The only issue is that I need to start school soon to work on getting into medical school. I plan on having our kids, going to school and being a stay at home mom until I get my degree then I plan on getting a career so my husband can retire and be home with the kids and take them to school, sports , stuff like that while I work. If I have another I am afraid it will put me more behind. Idk what to do ladies. I know I won’t regret having another child, but everyone’s telling me to wait until I finish school which is 3 years and then 4 if I continue and go to medical school.