User blog comment:Merlaa/Pendragons - The Diamond of the Day./@comment-5674726-20121229001036

''It's wishful thinking, but you could think that Gwen was recently pregnant in the end. I mean, her coronation would be no more than one week after Arthur's death, and since they were sleeping together before the battle, it's always possible.''

It's possible but I'd say that it's very unlikely. They were married more than four years without any sign of a child, after all.