Why can't I stop thinking about it?! When will the feeling go away? 
I have 2 DC. Feeling very lucky and realistically for a number of reasons I want to stick at 2, financial reasons, don't want to pay big childcare bills again, don't really fancy pregnancy and birth again, don't do well with lack of sleep, the logistics of a family of 5 seem like a faff.
However, I just can't seem the shake the thought of oooo just go for jt!