Those pictures do not show a guppy that is close to a drop at all. She may have bred but is not close to giving you fry any time soon. Ignore the gravid spot and spend your efforts looking at her shape instead. A guppy that is getting close will be quite large in the abdomen with a squarish look to the belly. The belly line will drop down sharply from just behind her gills and become flat across the bottom, then rise sharply back up near her anal fin. The swelling will be quite apparent at a casual glance. If you need to stop and examine her, she is not even close, when her shape yells at you from across the room, it is worth a closer look for other clues. .