So that's what caused Rob Kardashian and Blac Chyna's big fight!
In this exclusive first look at E!'s upcoming six-episode docu-series Rob and Chyna, the engaged couple and parents to-be get in a blowout fight as their prepare for the birth of their baby.
"I fell in love with you because I know how good you are and how loyal you are," Rob tells Chyna in the video.
Cut to Chyna screaming at Rob over the phone, "Are you still texting bitches, yes or no?" before she slams the door on him. Yikes!
In addition to their tiff, which caused some break up rumors  a few weeks ago, we see the lovebirds laughing, loving and sharing lots of sweet PDA. Rob even kisses Chyna's bare baby bump as she asks him, "Are you ready to be a daddy?" Too cute!
The clip ends with the tagline, "They're cute, they're complicated and they're about to become family."
Watch our exclusive first look at Rob & Chyna for yourself to see the Kardashian family make a cameo!