Actually, one Play by Message Board game I'm in had that happen. And she DID get pregnant. With twins.

Admittedly, this game has taken place over the events of... I don't really know how long. The party consists of pureblood werewolves, elves homebrewed with a longer lifespan, and other long-lived species, so the time spent NOT adventuring and just giving RP or telling stories is easily given.