Nope. My mother was previously married to my older sister's father (and probably divorced from him, but I'm not sure) by the time I was conceived three and a half years later. The person who sired me never married my mother.
Nope, and neither was my stillborn sister. My parents were good little Catholics, married as virgins, unlike their eldest son (who got his fiancée pregnant and is no longer Catholic). My daughter is not the reason my wife and I got married either, just why we got married considerably earlier than originally planned.