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Is it already over for Rob Kardashian and Blac Chyna?

Breakup rumors have begun to envelope the expecting and engaged duo after Rob deleted all photos of his baby mama on his Instagram account. It's been three weeks since she posted about him, too.

In fact, Rob deleted all but one photo from his Instagram, including a recent photo he shared of himself looking slim.

According to a report in The Mirror, the couple split after "discovering suspicious messages on her phone."

MediaTakeOut.com said the couple was taping for "Keeping Up With the Kardashians" when Rob saw the texts, prompting a huge fight on camera.

Neither has commented on the matter, nor has any of his omnipresent reality TV family.

It was reported that they unfollowed each other on social media after the fight, but Chyna has since re-followed Rob. He has yet to follow her back, according to People magazine.

Over the weekend, it seemed that things were completely on the up and up with the couple. Rob's sister and Chyna's one-time BFF Kim Kardashian West told E! News that they were incredibly excited about having a girl.

"They have talked to me about names but I can never tell. That's really personal to them," she said. "If they want to share that, they could, but we're just there to support them and we're just so excited that we're getting a new cousin.

"I was FaceTimeing with Chyna the other day," she said, "explaining to North that there's a baby in her belly and sharing the sonogram picture with North and explaining that we have a new cousin and it's so exciting."

This isn't the first time that rumors of a split have surrounded the duo because of Rob's social media tendencies, of which he often posts and deletes photos. In March, he cleared his social media, erasing all traces of Chyna.

"Chy and I are not broken up we just feel like it would be a lot healthier for our relationship if we kept a lot more to ourselves," he said at the time. "It's impossible to have a positive relationship with so much negativity from the media and outsiders and we would appreciate it if everyone respects that."