This is kind of similar;
I have been baby crazy for the last two and a half years. The weekend before July 4th this past year, we went to visit DH's grandfather for his birthday and I was talking to one of his cousins. I actually said, "Yeah, I'm glad we decided to wait a little longer because I'm not so sure I'm ready to be a mom."
That night when we got home, I took a positive pregnancy test. It has to be some sort of hormonal chain reaction.