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The mid-season finale of Keeping Up with the Kardashians ended with a surprise: Kim Kardashian revealed she’s pregnant with a second child.

“I just got the blood test back,” Kim Kardashian told sister Khloe Kardashian in the teaser, “and I am pregnant.”

Kardashian, who spent the Sunday night tweeting about the Keeping Up with the Kardashians episode, did not make reference to the pregnancy on her Twitter account. But she did tease that Sunday’s episode included a must-see moment.

Both Kardashian and husband Kanye West have previously discussed a desire to add a second child to their family. (North West was born in June of 2013.)

“It’s been more challenging to get pregnant the second time around. When you’re not planning it, it happens. It’s just how God works. And when you want it so bad, it’s not happening,” Kardashian said to the Daily Mail in January.

That same month, West told Ellen DeGeneres that the couple was trying for baby number two. “I just want whatever Kim wants,” West said.

Speaking to E! Online, Kardashian said she and West were trying to have another baby “every single day.”

“You can’t try harder than we try,” she said. “It’s getting exhausting. He always says, ‘Trying for baby No. 2 isn’t as fun as trying to baby No. 1.'”

For more on Kardashian’s news, head to PEOPLE.