'Fixer Upper' star Joanna Gaines says baby No. 5 was a 'total surprise'

"Fixer Upper" stars Chip and Joanna Gaines may be "so excited" for their fifth child, but baby No. 5 was never really part of their plan.

Speaking with People magazine for its latest cover story, the HGTV moguls opened up about discovering that they were expecting another child together and how it factored into their decision to bring their beloved "Fixer Upper" to an end after five seasons.

"I had been feeling a little emotional and crazy and thought, 'Wow, this isn't me,'" Joanna explained. "Then all of a sudden I realized, 'Hey, I remember this.' When I saw the results of the test, my jaw dropped."

"Chip was in the driveway about to leave when I called him back and said, 'We're pregnant,'" she continued. "He was so excited. We're both just so excited."

See photos of Chip and Joanna Gaines together:

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Chip and Joanna Gaines together
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Chip and Joanna Gaines together
NEW YORK, NY - DECEMBER 08: Designers Joanna Gaines and Chip Gaines attend AOL Build Presents: 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK, NY - DECEMBER 08: Designers Chip Gaines and Joanna Gaines attend AOL Build Presents: 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
THE CHEW - Chip and Joanna Gaines as well as Victoria Justice are the guests on Wednesday, October 19, 2016 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) CARLA HALL, CHIP GAINES, MICHAEL SYMON, JOANNA GAINES, DAPHNE OZ, CLINTON KELLY
THE CHEW - Chip and Joanna Gaines as well as Victoria Justice are the guests on Wednesday, October 19, 2016 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) JOANNA GAINES, MICHAEL SYMON, CHIP GAINES
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines appear to promote 'The Magnolia Story' during the AOL BUILD Series at AOL HQ on October 19, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines appear to promote 'The Magnolia Story' during the AOL BUILD Series at AOL HQ on October 19, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
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Joanna, who is due to give birth to their fifth baby this summer, admitted that the revelation that she was pregnant factored into the couple's decision to leave the show that made them household names -- it simply would've become too much, and it was a sign that they should move on.

"When we were done, we had no plan like, 'Let’s have baby No. 5,'" Joanna said. "It was a total surprise. But when we found out, it solidified that it was the right decision to leave when we did."

"We had a lot on our plates, and at some point you have to call those shots when you feel like you need a break," she added.

SEE ALSO: Christina El Moussa and Ant Anstead celebrate 6-month anniversary with adorable PDA pic

Chip and Joanna already share Drake, 13, Ella, 11, Duke, 9, and Emmie, 8. The future mother of five said that her children are "all rallying around this baby."

Take a peek inside Chip and Joanna Gaines' home:

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Inside Chip and Joanna Gaines' home
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Inside Chip and Joanna Gaines' home
Played in the dirt this weekend and spruced up the front porch with a variety of hydrangea plants. Now time for a Sunday nap 💚 #homebody #andplantladytoo
It's time for bed but I was determined to find a perfect spot for this metal verse. #fourthtimesthecharm
One day I will show you what's inside this extra large hutch... #dishjunky #farmhouse
May your day be Merry and Bright! #merrychristmas
Rearranging living room today made the space feel so much bigger. #monstertreeisgone #rearranginganditfeelssogood #farmhouse
This rainy day is making it really hard for me to leave for work. #homebody
I may have gained ten pounds today... #christmasbaking
Formal sitting room turned office. Chk out the details on my site. #makeyourspacesworkforyou
Day 10: allergies aren't fun and they got the best of me tonight. So I did some sit ups and called it a day. Showing up is the hardest part #healthybody #healthymind #youcandoit
Excited to announce that soon and very soon you will be able to get the farmhouse style online and at our storefront boutique! #openingmay2014
A farmhouse for the dolls, fairies, and other lucky miniatures. #farmhouse
The hardest thing about bunk beds is when you have to actually make the bed. I just got simple striped sheets #potterybarn and a nice throw blanket #target for the edge of the bed. This cuts the time in half and it still has a finished casual look
Boys bathroom after a good cleaning. #howdoesitgetsodirty #farmhousestyle magniolia farms vanity built by @ckharp
Upstairs reading nook #ifonlyiwasareader #farmhouse
Are you crafting this summer? #imnotbutwishiwas #createandinspire
The jasmine vines are finally doing their thing and framing out the front of the greenhouse
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"I think it's sweet because they're older now," Joanna said. "I can see them wanting to be a part of this."

Joanna Gaines has had a lot to celebrate lately: The beloved television personality recently turned 40 and released her first-ever cookbook, "Magnolia Table," which you can buy here.

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