Travis Scott and Kylie Jenner walked with purpose Saturday night ... just a day after TMZ broke the story ... she's pregnant.

Kylie joined Travis in Vegas, where he performed but made no mention of his soon-to-be kid.  She's wearing loose fitting threads, which is probably the way we're gonna see her for the next 5 months.

As we reported, Travis was boasting to his buds a week ago that they're expecting a girl.

If big sister Kim is any indication, Kylie will have no problems bouncing back. And at least for now, she's still being Kylie ... French Montana can attest to that.

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