I don't think there's always a right or wrong answer when contemplating having another child. I do think, however, that there's a certain peace a parent must make with him or herself, regarding this question, or any other.
When I tell people I don't actually want more children they look at me like I've just said the most horrible thing. When you tell people you don't want more children, they look at you like you hate children -- in particular your own.
I don't think my take on this is unreasonable. Nor does my husband, who likes to sleep in even more than I do.