Kim Kardashian on how her surrogacy experience is 'different' with baby No. 4 (Exclusive)

Kim Kardashian West is opening up to ET about awaiting baby number four. 

ET's Keltie Knight spoke to the 38-year-old reality star about her new sunglass collection with Carolina Lemke eyewear on Tuesday in Los Angeles, where she also discussed expecting her fourth child with her husband, Kanye West. Kim confirmed the couple was expecting a baby boy in January via surrogacy. The reality star -- who had notoriously difficult pregnancies with both 5-year-old daughter North and 3-year-old son Saint -- also welcomed 1-year-old daughter Chicago via surrogacy last January, though she isn't using the same surrogate for their fourth child.

Kim says her surrogacy experience this time around isn't like her experience with Chicago, especially since she's more aware of what to expect.

"It's a different experience for sure, this situation is different," she tells ET. "I love my surrogate, we have a really good relationship. I really trust her and I definitely see, like, the first time that I went through it, I was a little bit more anxious, and texting more and calling more, and I feel like my surrogate this time around, really is such a protecting person and I really trust that in her."

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Kim Kardashian's best looks from 2018
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Kim Kardashian's best looks from 2018
WEST HOLLYWOOD, CA - MARCH 13: Kim Kardashian West attends Lorraine Schwartz launches The Eye Bangle a new addition to her signature Against Evil Eye Collection at Delilah on March 13, 2018 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Lorraine Schwartz )
TOKYO, JAPAN - MARCH 02: Kim Kardashian, Kourtney Kardashian and Khloe Kardashian are seen upon arrival at Tokyo Station on March 2, 2018 in Tokyo, Japan. (Photo by Jun Sato/GC Images)
Kim Kardashian arrives for the 2018 Met Gala on May 7, 2018, at the Metropolitan Museum of Art in New York. - The Gala raises money for the Metropolitan Museum of Arts Costume Institute. The Gala's 2018 theme is Heavenly Bodies: Fashion and the Catholic Imagination. (Photo by Angela WEISS / AFP) (Photo credit should read ANGELA WEISS/AFP/Getty Images)
NEW YORK, NY - MAY 09: Kim Kardashian is seen walking in Soho on May 9, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - MAY 08: Founder and CEO, KKW Kim Kardashian attends an intimate dinner hosted by The Business of Fashion to celebrate its latest special print edition 'The Age of Influence' at Peachy's/Chinese Tuxedo on May 8, 2018 in New York City. (Photo by Dimitrios Kambouris/Getty Images for The Business of Fashion)
NEW YORK, NY - JUNE 04: Kim Kardashian attends the 2018 CFDA Awards at Brooklyn Museum on June 4, 2018 in New York City. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NY - JUNE 14: Kim Kardashian seen on the streets of Manhattan on June 14, 2018 in New York, NY. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - JUNE 15: Kim Kardashian, Kanye West, North West seen on the streets of Manhattan on June 15, 2018 in New York, NY. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
Kim Kardashian attending the 2018 MTV Movie and TV Awards held at the Barker Hangar in Los Angeles, USA. PRESS ASSOCIATION Photo. Picture date: Saturday June 16, 2018. Photo credit should read: Francis Specker/PA Wire (Photo by Francis Specker/PA Images via Getty Images)
CENTURY CITY, CA - JUNE 18: Kim Kardashian West attends the BoF West Summit at Westfield Century City on June 18, 2018 in Century City, California. (Photo by Christopher Polk/Getty Images for The Business of Fashion)
PARIS, FRANCE - JUNE 21: Kim Kardashian arrives at the Louis Vuitton Menswear Spring/Summer 2019 show as part of Paris Fashion Week on June 21, 2018 in Paris, France. (Photo by Pierre Suu/Getty Images)
LOS ANGELES, CA - JUNE 30: Kim Kardashian West attends KKW Beauty Fan Event at KKW Beauty on June 30, 2018 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for ABA)
LOS ANGELES, CA - JULY 15: Kim Kardashian West attends the Beautycon Festival LA 2018 at Los Angeles Convention Center on July 15, 2018 in Los Angeles, California. (Photo by Phillip Faraone/WireImage)
INGLEWOOD, CA - JULY 29: Kris Jenner (L) and Kim Kardashian West attend the first annual 'If Only' Texas hold'em charity poker tournament benefiting City of Hope at The Forum on July 29, 2018 in Inglewood, California. (Photo by Rich Fury/Getty Images)
LOS ANGELES, CA - JULY 30: Kim Kardashian is seen at 'Jimmy Kimmel Live' on July 30, 2018 in Los Angeles, California. (Photo by RB/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Kim Kardashian is seen on August 9, 2018 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
BEVERLY HILLS, CA - AUGUST 21: Kim Kardashian West attends Christie's x What Goes Around Comes Around 25th Anniversary Auction Preview at What Goes Around Comes Around on August 21, 2018 in Beverly Hills, California. (Photo by Michael Kovac/Getty Images for What Goes Around Comes Around)
LOS ANGELES, CA - SEPTEMBER 27: Kim Kardashian is seen wearing a money dress and matching boots on September 27, 2018 in Los Angeles, California. (Photo by PG/Bauer-Griffin/GC Images)
NEW YORK, NY - SEPTEMBER 28: Kim Kardashian is seen in SoHo on September 28, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 29: Kim Kardashian (R) and North West seen in Manhattan on September 29, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - SEPTEMBER 29: NorthWest and Kim Kardashian are seen on September 29, 2018 in New York City. (Photo by MediaPunch/Bauer-Griffin/GC Images)
NEW YORK, NY - SEPTEMBER 30: Kim Kardashian is seen in SoHo on September 30, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - OCTOBER 09: Kim Kardashian attends the 2018 Tiffany & Co. Blue Book Gala on October 9, 2018 in New York City. (Photo by Steven Ferdman/WireImage,)
LOS ANGELES, CA - NOVEMBER 03: Kim Kardashian West attends the 2018 Art+Film Gala at LACMA on November 3, 2018 in Los Angeles, California. (Photo by Taylor Hill/Getty Images)
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Kim Kardashian backstage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185073 -- (Photo by Todd Williamson/E! Entertainment/NBCU Photo Bank via Getty Images)
NEW YORK, NEW YORK - DECEMBER 02: Kim Kardashian West attends the the Versace fall 2019 fashion show at the American Stock Exchange Building in lower Manhattan on December 02, 2018 in New York City. (Photo by Roy Rochlin/Getty Images)
NEW YORK, NEW YORK - DECEMBER 03: Kim Kardashian West attends the opening night of the new musical 'The Cher Show' on Broadway at Neil Simon Theatre on December 03, 2018 in New York City. (Photo by Dominik Bindl/Getty Images)
COSTA MESA, CA - DECEMBER 04: Kim Kardashian West attends the KKW Beauty Pop-Up at South Coast Plaza on December 4, 2018 in Costa Mesa, California. (Photo by Stefanie Keenan/Getty Images for KKW Beauty)
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"So, I feel really calm and at ease," she continues. "I don't know if it's a fourth kid thing or, we've been through the surrogacy before, you just get a little bit more calm as they go."

The Kim Kardashian West Collection with Carolina Lemke eyewear launched on Tuesday and consists of seven styles, with more coming soon. It's available at carolinalemke.com.

"I like to change up my look all the time so to have so many options," Kim tells ET about the wide variety of the sunglasses collection. "We have over 20 styles that are going to be launching before summer. I got so into it that I couldn't choose. I just had to have more styles because they're so affordable, you can mix it up more."

Tune in toEntertainment Tonight on Tuesday to hear Kim open up about forgiveness.

During Sunday's season 16 premiere of Keeping Up With the Kardashians, Kim actually admitted to sister Kylie Jenner that she was "low-key freaking out" about having another baby. 

"I didn't think it was going to happen," she said. "I thought like, 'Oh, it probably won’t even take.'"

But in January, a source told ET that she and Kanye have always wanted a big family. 

"Their first time with surrogacy went so well, they decided to do it again," the source said. "The couple is excited to welcome such an incredible gift in 2019. They’ve also talked that after this child, they are most likely done having kids."

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