What should I do, about baby #2?

I'm 20
S/o is 25 
We have a 4 1/2 month old Daughter
And we're talking about having at least 2 more...
I miss being pregnant and can't wait to get a positive test in the future. 
He can't wait either. 
However we wanna do more stuff before we have more. What should we do? 

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