So, some minor spoilers below to Star Wars episodes 3 and 5, though I really don't think anyone should not know about this.
Anyway, I got to reading this question about why Anakin thought he could save Padme when she was so close to giving birth, and the (currently) top-voted answer raised even more questions about how long Padme had actually been pregnant when she died. Either Lucas didn't give her enough of a belly or her newborns were much too old when they came out. From this, I began wondering why Padme hadn't been visibly pregnant at the start of Episode III, since as far as I could tell the movie took place over at most a few weeks.
So that got me wondering, is there anything in the EU (either still canon or canon until Disney took over) about when Anakin and Padme 'did the deed'? And, from this event, could it be estimated how far along Padme was in her pregnancy when she gave birth?