For each girl, at 8 months pregnant, there is no picture of her, no statement of the fact that she’s 8 months in, and no option to visit her. I think their progress pics were all shifted for one month earlier.
If you have multiple breast enlargement potions in inventory, and you use one on someone who isn’t Sapphira, then at the bottom of the text you have the option to immediately use another. This second one applies to the next girl down in the list (Amelia -> Elara -> Sapphira) who hasn’t had an enlargement yet. The text of this usage will have Sapphira’s text, even if it’s actually Elara (having started the chain on Amelia).
