An Encounter in the Forest at night. [Timpossible]

Even in the most obscure areas, (in this case slightly dangerous ones, considering the clickers and roaming gangs and all), Ellie makes time to get some proper dicking. My guess it’s a pre-planed encounter…away from prying eyes and current partners…like Dina.
My only 2 questions are, 1.) considering this encounters ending, isn’t there a risk of getting preggers? and boom, you secret is out. 2.) What makes Ellie think Dina isn’t doing likewise with the other suppliers and ex’s when she gets that craving for dick?