Gabrielle Union painfully recounts her struggle to have kids, says she's had '8 or 9 miscarriages'

Gabrielle Union says it was not until she became a stepmom that she realized she wanted children.

In excerpts given to People from the 44-year-old actress' memoir, We're Going to Need More Wine, Union opens up about her and husband Dwyane Wade's heartbreaking struggle to have children of their own and the lengths she's gone to in trying to conceive.

"I have had eight or nine miscarriages," she writes. "For three years, my body has been a prisoner of trying to get pregnant -- I've either been about to go into an IVF cycle, in the middle of an IVF cycle, or coming out of an IVF cycle."

MORE: Gabrielle Union on Not Having Kids Yet -- 'The Penance for Being a Career Woman Is Barrenness'

Union says in her book that after three years of enduring failed IVF treatments, she and her husband "remain bursting with love and ready to do anything to meet the child we've both dreamed of."

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MIAMI BEACH, FL - AUGUST 29: (EXCLUSIVE COVERAGE) Gabrielle Union and Dwyane Wade leave their wedding rehearsal dinner at Prime 112 Steakhouse on August 29, 2014 in Miami Beach, Florida. (Photo by Olivia Salazar/Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0173 -- Pictured: (l-r) Actress Gabrielle Union during an interview with host Jimmy Fallon on December 1, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Kyle Richards and Gabrielle Union -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 30: Gabrielle Union and guest attend the Miami Heat vs New York Knicks game at Madison Square Garden on November 30, 2014 in New York City. (Photo by James Devaney/GC Images)
MIAMI, FL - NOVEMBER 19: Gabrielle Union and Karla Martinez make an appearance on the set of Univision's Despierta America to promote her new movie 'Top Five' at Univision Headquarters on November 19, 2014 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI, FL - NOVEMBER 18: Gabrielle Union attends 'A Night On The Runwade' fundrasing event at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Bobby Metelus/Getty Images)
MIAMI, FL - NOVEMBER 18: Gabrielle Union and Dwyane Wade pose on the Run way at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Thaddaeus McAdams/FilmMagic)
MIAMI, FL - NOVEMBER 18: Dwyane Wade and Gabrielle Union share a moment at the 'A Night On The Runwade' fundrasing event at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Bobby Metelus/Getty Images)
MIAMI, FL - NOVEMBER 18: Gabrielle Union and Dwyane Wade attends 'A Night On The Runwade' fundrasing event at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Bobby Metelus/Getty Images)
MIAMI, FL - NOVEMBER 18: Gabrielle Union and Dwyane Wade attend 'A Night on the Runwade' to benefit Wade's World Foundation at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Alexander Tamargo/WireImage)
MIAMI, FL - NOVEMBER 18: Gabrielle Union and Dwyane Wade attend 'A Night on the Runwade' to benefit Wade's World Foundation at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Alexander Tamargo/WireImage)
MIAMI, FL - NOVEMBER 18: Dwyane Wade and Gabrielle Union attend 'A Night on the Runwade' to benefit Wade's World Foundation at Ice Palace Film Studios on November 18, 2014 in Miami, Florida. (Photo by Alexander Tamargo/WireImage)
MIAMI BEACH, FL - AUGUST 29: (EXCLUSIVE COVERAGE) Gabrielle Union arrives at their wedding rehearsal dinner at Prime 112 Steakhouse on August 29, 2014 in Miami Beach, Florida. (Photo by Olivia Salazar/Getty Images)
MIAMI BEACH, FL - AUGUST 29: (EXCLUSIVE COVERAGE) Gabrielle Union and Dwyane Wade leave their wedding rehearsal dinner at Prime 112 Steakhouse on August 29, 2014 in Miami Beach, Florida. (Photo by Olivia Salazar/Getty Images)
MIAMI GARDENS, FL - MARCH 16: Actress Gabrielle Union (L) and NBA player Dwyane Wade speak onstage during Day 2 of Jazz In The Gardens at Sun Life Stadium on March 16, 2014 in Miami Gardens, Florida. (Photo by Aaron Davidson/Getty Images for Jazz In The Gardens)
HOLLYWOOD, FL - AUGUST 01: Jamie Foxx and Gabrielle Union share a laugh after a game at Dwyane Wade's Fourth Annual Fantasy Basketball Camp at Westin Diplomat on August 1, 2014 in Hollywood, Florida. (Photo by Bobby Metelus/Getty Images)
MIAMI, FL - JUNE 10: Gabrielle Union and Chantel Christopher arrive at the NBA Finals Game 3 at AmericanAirlines Arena on June 10, 2014 in Miami, Florida. (Photo by Bobby Metelus/Getty Images)
HOLLYWOOD, FL - AUGUST 03: Chantel Christopher, Gabrielle Union and Dwyane Wade at Dwyane Wade's Fourth Annual Fantasy Basketball Camp at Westin Diplomat on August 3, 2014 in Hollywood, Florida. (Photo by Bobby Metelus/Getty Images)
NEW ORLEANS, LA - FEBRUARY 15: Actress Gabrielle Union and Miami Heat Shooting Guard Dwyane Wade attend GQ & LeBron James NBA All Star Party sponsored by Samsung Galaxy and Beats at Ogden's Museum's Patrick F. Taylor Library on February 15, 2014 in New Orleans, Louisiana. (Photo by Erika Goldring/Getty Images for GQ)
NEW ORLEANS, LA - FEBRUARY 14: Dwyane Wade and Gabrielle Union are seen during NBA All-Star Weekend 2014 at on February 14, 2014 in New Orleans, Louisiana. (Photo by Bobby Metelus/Getty Images)
CORAL GABLES, FL - JANUARY 24: Dwyane Wade and Gabrielle Union attend the Miami Heat Family Foundation TaHEATi Beach Fundraising Event brought to you by Hublot on January 24, 2014 in Coral Gables, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI, FL - DECEMBER 02: Dwyane Wade and Gabrielle Union are seen at Prime 112 for a special dinner to celebrate the partnership between Hublot and Miami HEAT player Dwyane Wade on December 2, 2013 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images for Hublot)
MIAMI BEACH, FL - JANUARY 27: Dwyane Wade and Gabrielle Union arrive at South Beach Battioke 2014 at Fillmore Miami Beach on January 27, 2014 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI, FL - NOVEMBER 21: Ken Gorin, Gabrielle Union and Dwyane Wade make an appearance at the unveiling of the new Maserati Ghibli at The Collection on November 21, 2013 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images for The Collection)
MIAMI, FL - NOVEMBER 21: Dwyane Wade and Gabrielle Union make an appearance at the unveiling of the new Maserati Ghibli at The Collection on November 21, 2013 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images for The Collection)
MIAMI, FL - NOVEMBER 21: Gabrielle Union and Dwyane Wade make an appearance at the unveiling of the new Maserati Ghibli at The Collection on November 21, 2013 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images for The Collection)
MALIBU, CA - SEPTEMBER 21: (EXCLUSIVE COVERAGE) Miami Heat basketball player Dwyane Wade and actress Gabrielle Union are sighted enjoying a beach outing on September 21, 2013 in Malibu, California. (Photo by Bobby Metelus/Getty Images)
MALIBU, CA - SEPTEMBER 21: (EXCLUSIVE COVERAGE) Actress Gabrielle Union and Miami Heat basketball player Dwyane Wade are sighted enjoying a beach outing on September 21, 2013 in Malibu, California. (Photo by Bobby Metelus/Getty Images)
HOLLYWOOD, CA - JULY 16: Professional basketball player Dwyane Wade (L) and actress Gabrielle Union attend ESPN The Magazine 5th annual 'Body Issue' party at Lure on July 16, 2013 in Hollywood, California. (Photo by Michael Kovac/WireImage)
MALIBU, CA - SEPTEMBER 21: (EXCLUSIVE COVERAGE) Actress Gabrielle Union and Miami Heat basketball player Dwyane Wade are sighted enjoying a beach outing on September 21, 2013 in Malibu, California. (Photo by Bobby Metelus/Getty Images)
WEST HOLLYWOOD, CA - SEPTEMBER 20: Actress Gabrielle Union and NBA player Dwyane Wade attend the Entertainment Weekly pre-Emmy party at Fig & Olive Melrose Place on September 20, 2013 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
VENICE, ITALY - SEPTEMBER 01: Dwyane Wade and Gabrielle Union is seen leaving the Venice Airport during The 70th Venice International Film Festival on September 1, 2013 in Venice, Italy. (Photo by Jacopo Raule/FilmMagic)
VENICE, ITALY - AUGUST 29: Gabrielle Union and Dwyane Wade attend Miu Miu Women's Tales during the 70th Venice International Film Festival on August 29, 2013 in Venice, Italy. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - JULY 17: Actress Gabrielle Union and NBA player Dwyane Wade arrive at The 2013 ESPY Awards at Nokia Theatre L.A. Live on July 17, 2013 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
HOLLYWOOD, FL - AUGUST 15: Dwyane Wade and Gabrielle Union pose at the Dwyane Wade Fantasy Camp at the Seminole Hard Rock Hotel & Casino Hard Rock Cafe Hollywood at the Westin Diplomat Resort on August 15, 2013 in Hollywood, Florida. (Photo by Bobby Metelus/Getty Images)
LOS ANGELES, CA - JULY 17: (L-R) Actress Gabrielle Union, NBA player Dwyane Wade, NBA player LeBron James, and Savannah Brinson attend The 2013 ESPY Awards at Nokia Theatre L.A. Live on July 17, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for ESPY)
HOLLYWOOD, CA - JULY 16: Actress Gabrielle Union (L) and Professional basketball player Dwyane Wade attend ESPN The Magazine 5th annual 'Body Issue' party at Lure on July 16, 2013 in Hollywood, California. (Photo by Michael Kovac/WireImage)
WEST HOLLYWOOD, CA - SEPTEMBER 20: Actress Gabrielle Union and NBA player Dwyane Wade attend the Entertainment Weekly pre-Emmy party at Fig & Olive Melrose Place on September 20, 2013 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
HOLLYWOOD, CA - JULY 16: Actress Gabrielle Union (L) and Professional basketball player Dwyane Wade attend ESPN The Magazine 5th annual 'Body Issue' party at Lure on July 16, 2013 in Hollywood, California. (Photo by Michael Kovac/WireImage)
HANGZHOU, CHINA - JULY 11: Gabrielle Union and Dwyane Wade take some photos and share a kiss on at Green City Villa on July 11, 2013 in Hangzhou, China. (Photo by Bobby Metelus/Getty Images)
LOS ANGELES, CA - JUNE 30: NBA player Dwyane Wade and actress Gabrielle Union attend the 2013 BET Awards at Nokia Theatre L.A. Live on June 30, 2013 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - JUNE 30: Dwyane Wade (C) and Gabrielle Union (R) attend the 2013 BET Awards at Nokia Theatre L.A. Live on June 30, 2013 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for BET)
GUANGZHOU, CHINA - JULY 06: Dwyane Wade and Gabrielle Union visit Chimelong Safari Park on July 6, 2013 in Guangzhou, China. (Photo by Bobby Metelus/Getty Images)
SHANGHAI, CHINA - JULY 8: Dwyane Wade and Gabrielle Union arrive at Shanghai Airport to contuine Li-Ning ' Way of Wade' China tour on July 8, 2013 in Shanghai, China. (Photo by Bobby Metelus/Getty Images)
HOLLYWOOD, CA - JULY 16: Professional basketball player Dwyane Wade (L) and actress Gabrielle Union attend ESPN The Magazine 5th annual 'Body Issue' party at Lure on July 16, 2013 in Hollywood, California. (Photo by Michael Kovac/WireImage)
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Meanwhile, the Being Mary Jane star is loving being a stepmother to Wade's children -- which include his 16-year-old nephew, Dahveon Morris, and his sons from a previous marriage, Zaire, 15, and Zion, 10. The 35-year-old NBA pro also has a 3-year-old son named Xavier, who lives with his mother.

MORE: Gabrielle Union and Dwyane Wade Gush About Third Wedding Anniversary

Let's goooooo! #WadeWorldTour #Summer2017

A post shared by Gabrielle Union-Wade (@gabunion) on

"I never wanted kids," Union admitted to People. "Then I became a stepmom, and there was no place I'd rather be than with them."

In a 2015 interview with Redbook, the actress also opened up about not having kids of her own, and how she feels she's sometimes perceived. "So far, it has not happened for us. A lot of my friends deal with this," she said. "There's a certain amount of shame that is placed on women who have perhaps chosen a career over starting a family younger."

EXCLUSIVE: Dwyane Wade Gushes Over Wife Gabrielle Union's 'Sexy' Fashion

In good times and bad, Wade and Union always put up a united front. In July, ET caught up with Union, who gushed over her handsome husband's sense of style, and revealed the real reason she doesn't dress him.

Check out our interview with the actress ahead of the release of We're Going to Need More Wine, which is to be released on Oct. 17.

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