How do you tell if a slug is pregnant?

Identifying a pregnant slug can be challenging, as they don't have a visible pregnancy like mammals. Instead, you may notice a slug with a swollen body, especially in the area where its reproductive organs are located, indicating it may be carrying eggs. Additionally, if you observe a slug in a breeding behavior, such as mating or laying eggs in a moist environment, it suggests that it is likely pregnant or preparing to reproduce.