User blog:It's Good to be the Queen/No royal heir?

I've heard about some of the things going on for season 5, but there's no talk about a baby Pendragon. Does anyone know if the Merlin panel didn't explain why there is no heir to the throne after three years of marriage? Either Guinevere cannot conceive or she is purposely preventing pregnancy (with Gaius' help with potions). I'd like to think it's the latter. Arthur and Gwen's baby would be a legitimate heir to the throne; therefore a target for Morgana. The baby would not be safe until Morgana is in the ground.