Photo: Celeste Sloman for Universal Pictures

Carey Mulligan Publicity shot for She Said

Carey Mulligantypically keeps her home life with husband musicianMarcus Mumfordand their family close to the vest.

But starring in the new movieShe Saidinspired the British star to open up about her experience coping with postpartum depression after the birth of her first child, the two-time Oscar nominee says in this week’s issue of PEOPLE.

But what most don’t know is that when Twoheytook up the towering investigation with Kantor, she was on maternity leave coping with postpartum depression.

Universal Pictures

(from left) Megan Twohey (Carey Mulligan) and Jodi Kantor (Zoe Kazan) in She Said, directed by Maria Schrader

For Mulligan, “it was really going back to work in some form,” shooting the 2015 filmSuffragette, “that was the thing that got me on the road to finding myself again with incredible support around me.”

The difficult period is something Twohey had not shared publicly prior - not even the2019 non-fiction tomeshe co-wrote with Kantor, which provided source material for the new film.

“We don’t really talk about our personal lives,” Twohey tells PEOPLE. “We just focus on the work.” But in its film adaptation,She Saidmakes a point to show the full lives of the two working mothers as they chased printable proof of Weinstein’s sexual misconduct and staved off his legal team’s intimidation. For Twohey, it coincided with “one of the most vulnerable periods in my life.”

In the early days of the Times investigation, Kantor called Twohey, then more of a colleague than a friend, for advice about approaching Weinstein’s victims. What she didn’t know was that Twohey was quietly struggling following the birth of her daughter, who is now five.

“I could hear in Megan’s voice that something was wrong. And because I had postpartum depression, I suspected it in her,” says Kantor, whose daughters are 16 and 7. She swiftly shared a doctor referral.

Celeste Sloman for Universal Pictures

Cast of the film “She Said”

Twohey ultimately allowed filmmakers to include the intimate moment on camera.

“I thought Megan including it in the film when it was not in the book was just a really wonderful,” says Mulligan. “And I wanted to talk about it and say it’s horrible, and there’s a way through it. There’s just so many people who go through it. I think films just always allow a conversation (like this) to start.”

The actress hopes the filmspurs more open conversationaround the condition. “I felt like I was completely on my own when this happened to me,” she says. “And actually, so many people have experienced this. Megan has experienced it, and so many of my friends have, and we all feel horrific, like we’re the only person who’s ever been through it.”

Though the reporters say they had no idea what would happen once their work went public - certainly not Weinstein’s23-year convictionof sex crimes in New York, nor hiscurrent trial in Los Angeles-She Saidultimately represents “the truth” of the way the Weinstein investigation started, says Kantor.

“It was two women who were leaning on each other really hard to shoulder what felt like overwhelming responsibilities: the responsibility of being a parent, becoming a parent, raising kids, and then the responsibility of trying to unearth these difficult truths,” says Kantor. “And when I think back to the summer of 2017, I just think about the weight of both. This feeling of we have to get this story, which is so, so, so hard. We can’t fail. And then, we have to get home and get the kids. And you’re not really going to allow yourself to fail at that either.”

She Saidis in theaters now.

For more on She Said, pick up the latest issue of PEOPLE, on newsstands Friday, or subscribehere.

source: people.com