The spouses are already parents of sons Samuel, 5, and Isaiah, 3, as well as daughter Mia, 2, but according to Catherine, they may not be stopping there.
"We're still kind of looking into adoption," Catherine, 35, toldPeople, adding, "If we adopted, I would love to adopt a newborn, just because I love babies."
However, Catherine revealed, "But I think biologically, we're done, sad to say... It actually really hurts to say that, because I love being pregnant and the joy that that closeness brings."
Catherine admitted she "would probably have 20 children" if she could, responsibly.
"I love having children, I love being pregnant, I love all the things about it," Catherine shared. "But at a certain point, it feels a little selfish to continue to add children and not pour back into them."
"So, right now, we're really focusing on our three," she added.
The Bachelor alum explained how she and Sean had their kids "back-to-back."
"Now, the independence that they've given us and the time that we could breathe, has been really satisfying," Catherine said.
Catherine described motherhood as "rewarding" and also noted how life doesn't feel as "frantic" now that her children are a little older.
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"My personality is frantic, but now it's not like survival," she joked. "Everyone's going to be okay. I'm not worried about a baby falling off a couch anymore or getting into stuff."
Catherine dubbed her current lifestyle "a different chapter" and said she's really "enjoying it" with her husband.
Catherine anticipates those sweet days, however, will change once her children become teenagers.
"I'm very scared, more terrified, of Mia in her teenage years and what hormones do to young girls... I'm anticipating that being a pretty challenging chapter," Catherine admitted, adding how she also expects her sons' rooms to be very messy.
She concluded, "I think that moms should be celebrated, not just on Mother's Day... but every day. I think moms just don't get enough credit, to be honest."
Mia was born in December 2019 shortly before Christmas, and Catherine gave birth to Isaiah and Samuel in May 2018 and July 2016, respectively.
Sean and Catherine are the only couple in The Bachelor's 26-season history to tie the knot after getting engaged at the show's final Rose Ceremony.
"We've grown and [Catherine] has tried so hard to just be like the best wife possible. She's an incredible mother and, hopefully, I've grown up a little bit too in our marriage," Sean shared with People in May 2021.
The couple explained that learning each other's love language was important.
"He's a word of affirmation guy. So, like, whenever he's having a hard day, just being there and saying something that, he's doing a good job or 'I get it,' empathizing with him," Catherine previously told the magazine.
And Sean said of his wife at the time, "She loves to be validated. It took me a long time to figure this out instead of solving her problems, which most guys I think are problem solvers."
Sean also said he believes committing to your best friend is "the key" to a successful and happy marriage.
"If you get caught up and looks or like the romance, whichever one, anyone who's married knows romance is going to ebb and flow. It's not always going to be hot and heavy, but you always want to be with your best friends," Sean explained.
The Bachelor just wrapped its 26th season starring Clayton Echard in March on ABC. Clayton is currently dating Susie Evans, who dumped Clayton at the final Rose Ceremony but reunited with him post-filming.