Andrew Hetherington
May 11, 2016 10:20 AM

brightcove.createExperiences(); Blac Chyna‘s recent reveal of her baby news had best friend Amber Rose breathing a sigh of relief.

“I was the first person to know, obviously besides Rob [Kardashian],” Rose tells PEOPLE exclusively of her best friend spilling the beans earlier this year. “I wanted to shout it out to the world like this is my baby, but I couldn’t.”

In the moment, “I was screaming and like ‘Oh my God we’re having a baby!’ ” she says. “Chyna’s my family so if she’s having a baby, I’m having a baby.”

Amber Rose (left) and Blac Chyna

It’s much-needed support for the young mom, 28, who sources say is still largely on the outs with her future in-laws.

“The family still feels that Rob’s relationship with Blac Chyna is rushed,” a source told PEOPLE this week. Despite Rose holding her tongue, a rep for Chyna told PEOPLE that the couple’s baby news was allegedly leaked prematurely by a member of Kardashian’s family, seemingly to promote their show.

RELATED VIDEO: Rob Kardashian and Blac Chyna Make First Appearance Since Announcing Baby News

Still, says Rose, 32, the mom and pregnant bride-to-be couldn’t be happier.

“She’s ecstatic. She’s pregnant and she’s with a man that they’re both deeply in love with each other,” Rose says. “To be happy and in love and having a baby and getting married. It’s a great situation to be in.”

Amber Rose
Andrew Hetherington

Rose, who’s gearing up for her new VH1 talk show and just announced the return of her SlutWalk, says she’s happy to put shopping for her bridesmaid dress on hold for the baby.

“We’ve got some time for sure,” she says of the couple’s pending nuptials.

And though Chyna – who’s been busy with the launch of her CHYmoji app – was by her side at last year’s SlutWalk, Rose says, her pal’s got a great excuse to sit this one out.

“She’s going to probably be around 9 months then,” says Rose of the event in Los Angeles on Oct. 1, suggesting Chyna is currently around four months pregnant. “It depends on how she feels. I know she supports me no matter what, but it’s going to be hot! I would hate for her to be out there at 9 months!”

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