I'm currently 25 wks with number 3. There is no way we are having another. I don't do well in pregnancy and honestly DH was lucky to get #3.
I was quite happy with 2, but DH wanted 4. After the terrible ride I have had this pregnancy, he has thrown in the towel for number 4.
I honestly feel that anymore kids would make our lives difficult, no necessarily financially as we just adjust to it, but in regard to time management, and quality of life for our kids now. It took me quite a while to come to terms with #3.
I guess I'm the exception to what most women want. I hear of women begging their husbands for another baby, where as I'm begging my husband for no more babies haha. (Prob has something to do with him being one of four, whereas I'm an only child. not to mention the age gap between dd and ds is 13m, and between ds1 and ds2 will be 21m :0)
Anyways, I have been in the mind set of this is my last bub since before we even conceived, which I think is why it has been 'easy' for me.
With Ds1 I was thinking he might be the last, but there was still a little bit of doubt. Hence why we went for a third.
When it comes to logistically vs emotionally, unless you are emotionally ready, logistics will never come into play. You can think about the logistics of it all you like, but at the end of the day, if your not emotionally prepared you will never be at rest with your decision. IMO