I guess I'm in a fortunate position, in that I've got an interesting job (generally), a great boss I like and respect (generally) and some great colleagues. I want to make things as easy as possible for them after I go.
Also I've got a permanent senior position in science, something that I worked really hard to get, and work predominantly with men. I do feel that if I'm seen to not care any more it will make it harder for women behind me.
Whilst my baby is really wanted, there are a lot of things I haven't liked about pregnancy, including generally being patronised by the medical professions and the wolly food advice. I really like the fact that, whilst my work are being really sympathetic from a physical perspective (I've got to addrss the board tomorrow, and my boss has said he'll make sure there is a chair available!) I like the fact that I'm still taken prefessionally, despite looking like a mini hefalump
Finally, I don't want to be 'mummy-tracked' when I return, and so to me the work starts now.
Having said all this though, I recently screwed up a key meeting as I had had a really bad night and didn't feel fit to drive. The baby is certainly my priority, I'm just trying to think how hard I have work to get to where I am, and where I want to be afterwards.