I am also waiting on this "done" feeling that everyone I know talks about.
I have 3, the youngest just turned one, if I were to have another, then it would mean me getting pg next year, and I would like to know one way or the other. We have girls and a boy so we are completely set for clothing, I feel like I own every possible baby/child related item that I would possibly need.
The cons, children are expensive, I do not seem to produce cheap ones.
We can do 3 children, they can do extra-school activities, attend this awesome little school that we love, 4 would be pushing it. Our medical bills are insane, 2 of my 3 have some special needs, not severe, but enough that our monthly bills rival many a house payment. If the 4th needs daily therapy like DD1 does, it would be a hardship then.
I go back and forth daily, I think I could be good with 3, maybe but then I remember my dream was always 4 and I think that I probably would regret it in a few years. There is another part of me that wants this baby stage to be over and move on to having older children.