Well manageability and finances... will always be a factor for anyone.
Then, there is you. Since you are the Mom and will be the one home with your kids, when your Husband is away, due to him being in the Navy.
So ask yourself... how that would be for you?
How are you handling your 2 kids now??? Is that manageable for you? Is it easy-peasy or difficult????
You need to gauge, yourself.
Then there is the saying, that after 2 kids... having 3 is no different. Just more.
Then there is the saying that closely aged children, is more stressful.
Then there is the saying that the more spacing between children is good...because then the children are not going through developmental based difficulties at the same time and the older kids will be more mature developmentally and emotionally, by the time a 'baby' comes into the picture.
For me, my kids are 4 years apart. Just so happens. But also, I did NOT want kids one after another. I was NICE... to just have my daughter for 4 years, by herself, and for me. THEN when I had my 2nd child... she WAS already mature and emotionally to welcome a new baby into our family and she did not have any emotional problems about it or behavioral issues. For us, the age spacing between our kids is GREAT... and our kids are VERY close and 2 peas in a pod. They are best friends.
And then, it depends on how long it takes for your to get pregnant. But you are young. There is no biological clock ticking away.
I have a friend with 4 kids. Her kids are space like 2 years apart. She goes nuts. But they wanted a 'big' family. But she admitted to me that... sometimes, she is so stressed that she has to take a tranquilizer because she gets stress related health problems.
Then I have a friend with 3 kids.... close in age, and her Husband is away a LOT due to the nature of his job. She has a hard time.... and although a fantastic Mom and her kids are normal active boys... she is mostly a "Single Mom" and its not easy. Because her Husband is away on business trips so much and has LONG work hours. So she is very busy at home alone, managing the house and the childrens affairs.
Then I know a Mom of Triplets. So well, her Husband is away a lot on business too and works LONG hours. He's not home much. She goes berzerk sometimes. But as her kids are getting older, its getting easier in a sense...
The bottom line is: is the quantity of kids that you want... MORE important and to have a big family. OR... is the 'ability' to manage all the kids more important???? And to do it, happily.
AND also an important factor: Does your Husband, ACTIVELY help out with the children... daily, and participates in the child-care and raising of them, TOO? Is he responsible as a Dad and that he does help out??? If not... then, you will probably be the one, that does everything... even with a new baby.
all the best,
Susan