What made you decide you were done having kids?

I’ve been looking at older posts and asking around as well. When did you know you were done? Is there a concrete feeling where you’re like “nope, I’m good”. I have three 9,7,3 (we lost a pregnancy between 7&3 year olds). I feel like I’d want at least one more- hubby would have more in a heartbeat. I love that we are almost at the stage where everyone is independent—but that feeling is still there. Just wondering what other mama’s say about it.