Re: Princess Kate (aka the Duchess of Cambridge) is Pregnant!
They do now. They didn't in his dad's day. That's why the second in line to the throne married a commoner. They're allowed to marry whoever they want now. His father had to marry who he was told to marry and look how well that turned out. Ergo it stands to reason it was pointless to do any medical checks beforehand, not least because Diana's boys would have told the establishment to fuck off.
They couldn't hit an elephant at this distance.