I didn't plan it, but it ended up being quite funny. I didn't think I was pregnant, but I was late so I took a test, it was inconclusively strange so I took another and it said pregnant. DH was out of town, and I kind of panicked, with my last two pregnancies I just showed him the pee stick.
He flew home from Paris that night and had promised to get me some really nice wine. He walks in the door and hands me a bottle. I told him 'Thanks honey, but I can't drink this.'
He got a heart broken look on his face and started explaining the grapes and vintage and why he chose it specifically for me, when I told him it was perfect, but I still couldn't drink it.
(In his defense I had been pretty sure I wasn't pregnant as I had IB and thought my period had started and had told him about that three days earlier)