"You're trusting a surrogate with your unborn child and it's just scary," Khloe says at one point in the clip, holding up a thin vial.
The status of her relationship with Tristan is also called into question when Scott Disick asks the NBA star, "You're talking about having another child together, but you don't want to say you're official?"
"I'm not a secret," Tristan replies.
Khloe's older sister, Kim Kardashian West, welcomed her two youngest children, Chicago, 3, and Psalm, 1, via surrogate.
The Good American founder and Tristan rekindled their romance last year amid quarantine following the athlete's multiple cheating scandals.