B..
I just didn't want anymore. Honestly, I don't buy into this whole idea of being done, for many people. So many people NEVER feel done, but they are wise enough to stop. Whether that be age, relationship issues, financial issues, emotional issues, etc. I know many people who go to their grave wondering what it would be like to have more. Many people (especially, women) never just feel completely done. Rather, they accept that being done is best. Some people never just know, and there is always that twinge. Some people have to painfully learn to accept that they are done. Some people just know with 100% certainty.
I did feel done, because I didn't want anymore. However, I would have been fine not ever having children. Not that I don't adore my son, I just never HAD to be a parent. I'm glad I chose to, and one is plenty for me.