Anyone have 4 or more babies?

I'm looking for experiences from other parents who have a large family. We currently have 3 babies. 7,5,1. 
We happily stopped growing our family at 2 children until we had a little surprise that changed our lives for the better. 
Hubby is booked in for a vestectomy which has really got me thinking "Am I actually done?" I'm only 28, the 2 oldest are in full time school and I don't want this one growing up in it's own. 
I guess I'm wondering what it's like going from a family of 5 to 6? 
Did anyone go for a fourth and regret it? Or not go for a fourth and feel like something was missing?
I can't seem to shake this feeling of wanting another but I also feel greedy. We get by with the 5 of us but we live a humble life.