Michelle Obama has peeled back the curtain on her marriage to former President Barack Obama in a new memoir, revealing the strain the pair faced while trying to conceive.

Ahead of the release of Becoming on Tuesday, the former First Lady told ABC’s ‘Good Morning America’ she and Mr Obama turned to marriage therapy after a miscarriage which left her feeling “lost and alone”.

The 54-year-old said the pair’s marriage became strained after Mr Obama was elected to the Illinois Senate, leaving her to face in-vitro fertilisation treatment alone.

“Marriage counselling for us was one of those ways where we learned how to talk out our differences,” she told ABC.

“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.

Michelle Obama said she would “never forgive” Donald Trump for spreading misinformation that husband Barack Obama wasn’t born in the United States. Photo: Getty

“And we get help with our marriage when we need it.”

Mrs Obama, a former lawyer, revealed both their daughters, Malia and Sasha, were conceived through IVF after a miscarriage which left her feeling “lost and alone”.

The former First Lady said she wanted to talk about her fertility struggles to help other women facing similar challenges.

“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.”

Since vacating the White House in 2016, Mrs Obama has remained an outspoken critic of President Donald Trump and an advocate for women’s access to education.

Last March, publisher Penguin Random House signed the couple to a joint book deal, paying them a reported $US65 million for their respective memoirs.

In Becoming, Mrs Obama said she would “never forgive” Mr Trump for supporting the theory that her husband was not born in the United States.

“The whole thing was crazy and mean-spirited, of course, its underlying bigotry and xenophobia hardly concealed,” she wrote.

“What if someone with an unstable mind loaded a gun and drove to Washington? What if that person went looking for our girls?

“Donald Trump, with his loud and reckless innuendos, was putting my family’s safety at risk. And for this I’d never forgive him.”

Earlier this year it was announced the Obamas had also signed a content deal with Netflix which will see them will produce multiple documentaries, features and scripted and un-scripted series for the streaming giant.