To have another baby or not?

Hi everyone I’m 27years old and I have 5 beautiful kids, 7yo boy, 6yo boy, 5yo boy, 3yo boy and 1yo girl. I’m pretty sure my partner and I are on the same page and we will have one more kid but in a few years time and once we are more financially secure, bigger house etc There are times however when we both feel we are done and other times we are unsure. How did everyone else know they were done having babies? I feel deep down I am not done.