Olivia Munn Documented Breast Cancer Battle to Show Son She 'Fought to Be Here'

In an emotional sit-down with Michael Strahan on Thursday's episode of Good Morning America, the 43-year-old got candid about her health journey and her desire to expand her family.

"You never know what's going on in someone's life," Munn said. "Privately, people are battling things that you'd never know."

She shocked both her fans and followers when she revealed her cancer diagnosis on Instagram in March. As part of her ongoing treatment, Munn has undergone a double mastectomy -- just 30 days after she was first diagnosed.

When asked about the first thing that came to her mind when she was told she had cancer, Munn replied, "Honestly, I just thought of my baby."

Munn, who shares two-year-old son Malcolm with partner John Mulaney, said the she made an effort to document much of her experience to pass down to her child in the event that her treatment was unsuccessful.

"If I didn't make it, I wanted my son when he got older to know that I fought to be here," she tearfully admitted. "That I tried my best."

In addition to undergoing a double mastectomy, The Gateway actress was put into medically induced menopause. She has since had a hysterectomy and oophorectomy -- procedures done to surgically remove her uterus and ovaries.

Before that though, Munn underwent an egg retrieval process in the hopes of eventually having another child with the comedian.

"John and I had a long talk about it," she shared "We realized that we weren't done growing our family."

Given her cancer battle, the process of giving Malcolm a sibling hasn't exactly been straightforward.

"Right after the mastectomy, I went through a round of egg retrieval and that's a scary process because I have a cancer that feeds off of hormones, so I knew that there was a risk," Munn recalled. "Our doctor said, 'Look, we're gonna get one for you and then we're gonna call it.' And then our doctor called and he said, 'Hey, so we got the results back. It's two healthy embryos.' And I, I mean, just started bawling crying. Both of us."

She continued, "We just really hope it works out for us to be able to have another baby. We just want one more. I'm not gonna ask for too much more in this life, I promise. I just want one more baby."

While the cancer treatment has been exhausting, Munn said she's going to continue fighting the disease with a drug that will stop her body from growing the cancer producing hormones in her body.

"It's so tiring," Munn shared. "These drugs are so tiring and I know that I'm going to stay aggressive, I know I'm going to do it. ... It feels nonstop because it is nonstop."

Through all of this, Munn said she's learned she's "a lot braver" than she thought she was, but most important takeaway? Family is all that matters.

"The most important thing to me in life is my family," she maintained. "Everything else can go away. I don't have my career, I don't have my body the way that it looked before, but as long as the people I love and care about are here and healthy and thriving, nothing else matters."