Harder than I thought...

Conceiving my first was so simple. My husband and I decided to just go for it and it happened first try. We didn’t put much thought into it at all. Now that my son is almost a year and a half, I want a sibling for him and I want to have at least 2 children total. We can afford health insurance as we are military, we have a house on post with an extra room for another baby. I saved all of the pricey items from my son. Such as a crib, swing, clothes in case it would be a boy, toys, pretty much everything you would imagine. If it turns out to be a girl I would only need to get clothes, diapers, and wipes. I breastfed my son the entire 12 months and plan to do the same with this one if we conceive. The problem is we are stuck on whether or not we should try. I don’t want them too far apart. I want to have my children and be done with it. I don’t want my son to be 4 and 5 and then I have to start over. Right now I feel like I am in good shape to add another. My husband mentioned he hates that we don’t get to go on dates alone and he doesn’t have much free time. I stay home with my son and I do 85% of the care for him. The only thing my husband helps with is a diaper or two every now and then, and he bathes him for me. How do you know when it’s time to add to your family? I’m so lost. I feel like if I wait too long I will change my mind and end up only having 1.