Transcript for Michelle Obama opens up about miscarriage, new memoir 'Becoming'
Now we go to your exclusive with Michelle Obama. She's prepares to release her book, as you said, "Becoming," and, boy, in the book and also in this interview she really digs deep. Freeze extremely revealing. She does not hold back. She's been in the public eye for more than a decade, open, honest, now sharing personal stories about everything from her struggles to getting pregnant to how she and her husband work through challenges in their marriage. In her book, Michelle Obama calls this part of her story, becoming us about the meeting and marriage that would transform the trajectory of her life and challenge her in ways she would never expect. You ready to talk about Barack? Who. Reporter: While their mutual affection has always been on display now for the first time Michelle is ochoing up about marts of their marriage she held deeply private for years, first infertility. She writes, it turns out that even two committed go-getters with a deep love and robust work ethic can't will themselves into being pregnant. She did get pregnant but then weeks later she miscarried. I felt lost and alone and I felt like I failed because I didn't know how common miscarriages were because we don't talk about them. We sit in our own pain thinking that somehow we're broken. Reporter: She reveals it was with the help of infertility treatments that Maly and then Sasha were conceived. The biological clock is real because egg production is limited and I realized that as I was 34 and 35, we had to do ivf. I think it's the worst thing that we do to each other as women, not share the truth about our bodies and how they work and how they don't work. Reporter: And for the first time she shares details about how the stress of their hectic schedules infiltrated their marriage. You write about at one point in your marriage that you and Barack went to marriage counselling. Uh-huh. Why did you think it was important to share that? For those young people out there who think that marriage is supposed to be easy and marriage counseling for us was a way to learn how to talk out our differences. I learned my happiness was up to me and I started working out more. I started asking for help. Not just from him but from other people. I stopped feeling guilty, it's important for me to take care of myself. That's not on Barack. I know too many young couples who struggle and think that somehow there's something wrong with them and I want them to know that Michelle and Barack Obama who have a phenomenal marriage and who love each other, we work on our marriage and we get help with our marriage when we need it. Wow. Again, she was very insightful, very revealing, sharing stories she has never done before and it wasn't just limited to that. It can't be easy to talk about marriage counseling there. I asked why did she want to do it? Because she feels -- you see them dancing and happy and the kids and all that and she said it's so important and feels that, you know, our story, all of our stories unite us and it's very important to be open and to let people in and to see what their lives are really like. You've interviewed her quite a few times over the years. Is there a change since she's left the white house two years ago? No -- well, there is a change because now -- she was Mrs. Obama in the white house. She's Michelle again as she's able to freely express herself. The thing that's always remained the same about her and we'll show you something. She surprised her old high school ant went to a dance class. They thought the cameras were there because they thought we were filming something else. She walked in and they absolutely erupted in seeing her and that is the thing that's been consistent with her. She really -- they went on for quite some time. But she really wants to have an impact in young people's lives. That's why a lot of her accomplish tiffs when she was first lady were dealing with children and trying to do away with childhood obesity and such. But she -- it was totally unscripted she was there. Was supposed to get in and get out and spent an excessive amount of time and the way the young people responded to her and she said, you don't have to be in politics to be of service to others and she does touch upon politics in the book. She's been staying out of the political fray but in the book she has words for president trump. I want to put up something on the screen right now and, of course, he was propagating the whole birther issue and she wrote, what if someone with an unstable mind, loaded a gun, drove to Washington. What if that person went looking for our girls. Donald Trump with his loud and reckless inu anyone doughs was putting my family's safety at risk and for this I'd never forgive him. Because the rhetoric, because of the mistruths and lies that he was saying about the birther situation that was not true, she's a momma bear. Maybe that's Michelle now. Sorry about that. I actually -- I actually have -- no, I have an excuse. My wife had surgery yesterday and I had kept the phone on but she's doing great. Oh, my goodness, okay. So doesn't make fun of me. Saved by the bell. Saved by the bell. But, no, but Michelle Obama is a mamba bear when it comes to her family. You have the phone on because you want to know if Ali is okay. She wants to know her family is all right. When then candidate Donald Trump was saying that it's something she cannot forgive so -- I want to be very clear and she is as well that politics is nothing more than a chapter in her life story. It is not her life story. It is something that she touches upon, discussing about the on continues being different at the inauguration in 2016 as opposed to the two inaugurations when she was there and she speaks about that and she is really I think also it's going to be surprising to a lot of people, her candor in discussing how people underestimated her, doubted her, but also her level of honesty and her self-doubt throughout the book she kept saying am I good enough? Am I good enough? And that's something -- Even in the white house. Even in the white house. And that is something that a lot of times there will be women that will be reading or watching this special on Sunday and nodding along and that's again what she said. Her story is relatable but it is not -- it is so much more than politics and I know that a lot of people will pick up the paper today and seeing the headlines and that, it's such a small portion of her story, some portion in the book, but, yes, what she said about the president and not being able to forgive him because she felt he was putting her family at risk. And the family that she went through so much to have and which she put in the book as well but her honesty has always come through. That's why we saw the reaction those young ladies has and pretty much everyone has. She's going to have go on this book tour even have her live here on Tuesday and that night she'll be with Oprah Winfrey in the united center. 23,000 -- Forget about a book store. But she's also giving away 10% of all the seats on this tour, 10% going to high school students, other women's groups and that because she wants to make sure everybody has a chance to hear her story. Oprah will interview Sarah Jessica parker. Reese Witherspoon and the list goes on and on and the book is coming out Tuesday but she is really someone who -- she just -- I can't stress this enough, that she feels that our stories unite us and that hers is the American story and you'll see that when you read her book and see the special tonight. The book is Tuesday, the special is on Sunday night. "Becoming Michelle: A first lady's journey" with robin Roberts Sunday at 9:00, 8:00 central. Call Ali back. That was her doctor.
This transcript has been automatically generated and may not be 100% accurate.