Upcoming episodes of the Summer Bay soap see Sasha realise that she may be expecting Casey Braxton's baby following a night of passion between the pair.
Sasha's concern leaves her in turmoil as she feels unable to confide in Casey, knowing that he doesn't have strong feelings for her.
Harman told TV Week of the plot: "I was reading the storyline and I was like, 'Oh my gosh!' I was extremely sad about the pregnancy. It's a terrible thing to happen to a 16-year-old. It would be so shocking.
"I wouldn't have known what to do [at that age]. I probably still wouldn't know what to do."
As Casey has a lot on his mind following the recent shooting drama involving his father Danny, Sasha turns to counsellor Natalie Davison (Catherine Mack) for support instead.
Harman explained: "Sasha's main worry is having to talk to Casey about the pregnancy. It's so awkward for her, because their night together was a very 'in the moment' thing and it didn't mean as much to him as it did for Sasha.
"Sasha understands that Casey is in a really bad headspace at this point - he's got the court case coming up because he killed his father, so she goes to Natalie.
"Sasha has a genuine trust with Natalie. Sasha's mum died in a car crash before she moved to the Bay, so she thinks of Natalie as a mother figure."
Home and Away airs these scenes next week on Network Seven in Australia, and in January on Channel 5 in the UK.