I think it's inevitable that Bail and others on Padme's side of the Senate must have known or suspected the relationship, and would certainly have been aware of what was going on when she became visibly pregnant in the months leading up to RotS. It obviously wasn't the done thing to comment or interfere. Of the Jedi, I can excuse Obi-Wan not being aware of the pregnancy because he was off leading armies in the Outer Rim, but that he wasn't aware of the unusual closeness of his former Padawan and a certain Senator is very unlikely. At least TCW has explained why he might not have reacted with his usual pompous outrage to this knowledge. I'd like to see how Padme's other friends dealt with their awareness - and I'd especially like to see Ahsoka's reaction, who as Padme's new bessie mate and the one character that doesn't appear in RotS is uniquely placed to explore this. I suppose I'll have to sit through a few more dinner parties and shopping trips before that happens.