Happens all the time, casual acquaintances saying "you don't want any more then?" [anger]
I do want more, but haven't been lucky enough to have any. I have one beautiful dc and I know I'm lucky to have her. I miscarried her sibling and haven't felt able to conceive another. I don't see fit to comment on the size of other people's families, whether they have six children or none. So why should I have to explain my fertility issues to people who have no business asking me about this stuff.
Yes, I know they're just making "polite" conversation, but it's so bloody intrusive. Does it simply not occur to some people that other may be unable to have a second child - or indeed a first?