Me: So, how was lecture? I heard it was basically all of obstetrics in 50 minutes.
Jane: Yes! Oh, god. I was there, but I still don’t know what pregnancy is.
Jane: No, like… for real. What’s pregnancy?
Me: You can’t be serious.
Jane: Like, when does it start?
Peter: It starts 2 weeks before conception.
Me: … Er, no, that can’t be right. Maybe you meant 2 weeks before the 1st missed period?
Peter: No – I went to the lecture. Pregnancy definitely starts 2 weeks before conception.
Me: But that’s wrong. By definition.
Jane: I just looked it up. He’s right.
Me: What? No!
Jane: Hah. What now?
Me: … Maybe I’m the one who doesn’t know what pregnancy is.
That would be embarrassing, but it would make a whole hell of a lot more sense than my definition of pregnancy occurring 2 weeks before conception.