Our Kardashian sources tell us ... her social media post on June 25 is purely a coincidence -- she had no idea she was pregnant at the time. We're told Khloe's just shy of 3 months pregnant now ... and the surprise 33rd bday party Tristan threw her was 3 months ago.
We're also told "Dad" and "Mom" are just lovey dovey nicknames the couple have for each other ... though they now have a deeper meaning.
Want more proof Khloe didn't know she and her bf were going to have a baby? Here's what she tweeted the day after the party ...
Ok now I need a hangover remedy lol— Khloé (@khloekardashian) June 26, 2017