I know some people feel they definitely wanted to stop having children after having enough, and some people feel like they would always want more but stop for fertility/financial/practical reasons.
If you're the type of person who doesn't feel 'done' with having kids after three of them, are you the latter type? Or do some have got o or five and finally feel that's the right amount?
YABU people often feel done after their fourth + child
YANBU if you don't feel done after three you'll always be wanting more even if you had twenty kids