As the gang moves into their new, soon-to-be-five bedroom house, Ainsley, now into her second trimester, is preparing for a 'gender reveal' party, and for the arrival of her father and step-mother from Tasmania. After getting her first ultrasound snaps, she decides to announce her pregnancy on social media and carefully crafts a loving caption. However, this backfires spectacularly when Lachlan's ex Melanie (who's also pregnant to him), trolls Ainsley savagely, publicly branding her a "HOME WRECKING WHORE." Ainsley is mortified when her step-mother reads Melanie's attacks and learns the truth about Lachlan's complicated situation. The housemates advise Ainsley to delete the comments and forget about it… but that's not Ainsley's nature. Instead, she goes on a mission to reconcile with Melanie, determined to make an ally of the woman carrying her baby's sibling… all before the gender reveal party…