Becky pregnant in key scenes in book?
My guess is that the producers wrote Reese Witherspoon's pregnancy into the script. Highly pregnant women would not have been attending balls or receiving propositions of adultery. She also appeared to be pregnant in the later scenes in the film -- when the Marquess de Steyne comes on to her and when she is living years later in Germany. Her clothes were always loose-fitting and it seemed like she was often sitting or standing behind an object.
Do she and Rawdon have a child in the book? If so, does much happen during her pregnancy?
It also bothered me that the producers did little to make her and Amelia look like women in their 40s at the end.