Many people in this country wouldn't consider an abortion in any situation and they aren't all concertives.
You're presupposing politically conservative as socially conservative. They are linked but not mutually exclusive. This an incredibly socially conservative film. I know many people who wouldn't consider abortion but most of them are socially conservative.
I'm inclined to believe a woman who works at E! and is incredibly career driven - in an entertainment field! - would not have Seth Rogen's stoner baby.