nature decided for us (oh and too much wine ).
DS2 was "sort" of planned - we'd discussed no.2 and said we'd start trying at "some" point after DS1 started nursery/school........he was still at home when DS2 arrived.
DS3 was never planned at all, DH didn't want anymore, I did but had decided to wait a few years before trying to see if he could be persauded..........I'm now 28 weeks pg