Well, I was definitely unplanned, or a "big surprise" as my dad calls it.
My father was an alcoholic and his health was declining. On recommendation from a friend and nurse, he decided to sober up and headed off to detox/rehab. He was in detox for quite a while, but the exact length was never clear to me.
Almost exactly 9 1/2 months following his release from detox, I was born. I'd say he was VERY happy to see mom when he got home....
Funny thing about it was, my father at the time was 45 years old and mom was 35. They already had 3 children , the oldest 14 and the youngest was 8 at the time... then came me. Under the circumstances, in the world of Alcoholics Anonymous (of which my father is still a heavily participating member at age 68 (24 years of sobriety, w00t!), I am referred to as a "Sobriety Baby."
Kind of an interesting story, although kinda long. Sorry for the lengthy post.