This has been a very useful thread for me. Like the OP, I biologically want a third, against all practical reasoning - DH wants emphatically not to have another child. He knows I want one, I know and agree with his reasons not to. Now, I wouldn't ever deliberately get pregnant. But if I did fall pregnant by accident I couldn't pretend be anything other than delighted and I could never terminate.
However, as I am determined not to spend any more of my life depressed and spotty on the pill (tried all types, don't get me started, coil too, don't get me started on that either), if I'm honest I have not fully discussed with him in detail the fact that our current withdrawal method is not foolproof. He seems to think it is, he's in denial a bit in that he also thinks I am too old to conceive (I'm 36! I have just laughed that off up until now.) The risk now might be very small but we would stand to lose a lot with an accidental pregnancy - firstly, how would he ever trust that I hadn't engineered it on purpose?
So after reading this tonight I have just explained this to him properly, it didn't start well as he thought I was trying to restart the have-another-baby conversation! He refuses point-blank to consider a vasectomy, and I am in turn exercising my right not to take a pill that makes me some degree of crazy every single day of my fucking life. I have done that for 10 years of our relationship, to be fair, I just think it's his turn. Anyway we are at a standoff in some ways but thanks to this thread we are now completely up to speed with each other's point of view.
I am posting this just to say to you flamers that it's easier than you'd think to just not address things like this over time - in bed beforehand it's a total passion killer and afterwards would be useless - and some people (my DH) just feel awkward talking openly in the kitchen about issues like this. And in my experience men often don't know about the risks, for whatever reason. Head in sand, whatever.
OP I have been there, that day when you are a bit hungover the morning after a mistake, you are busy managing the kids and hoping your OH is going to get up and take over so you can get dressed and go out in the cold to the out of hours chemists, and he gets up late, you're bickering, parents are coming over, hoovering, toddler wees on the carpet, the day flies by, you reason with yourself that the risk is so small... surely if it happens, he'll come round... Also it was Christmas day, no-one does anything organised on Christmas day if they have kids do they? Some people on here have no empathy whatsoever. Congratulations, hope it all works out for you.