The 29-year-old is expecting his first child with the model and social media star, but sparked rumours of trouble in paradise when he deleted every photograph of Chyna from his Instagram account, and unfollowed her.
However, an insider said that while the engaged pair did have an argument, their relationship is still going strong.
"They're not broken up," the source told People.com.
Rob and Chyna were filming scenes for their upcoming reality show spin-off over the weekend (23-24Jul16) when they are believed to have had a row.
A separate source told Us Weekly that it was Rob's admission that he was feeling neglected by his lady love that led to the disagreement.
"Everything with Chyna is moving so fast. She’s a single parent and filming the show and all of her other work commitments, so Rob has been feeling neglected by her," an insider told the outlet.
"They were filming this weekend, and one of the people in her crew asked her to do something without him, and he snapped. He was p**sed that she was neglecting him again. He was just feeling neglected, and he always gets emotional and deletes things on social media when that happens. But things are fine now."
The People source adds that the row was just a minor blip in the pair's romance, adding that Rob is entirely smitten with his baby mama to be.
"It's hard to see Rob and Chyna actually splitting," the source added. "Rob is looking forward to becoming a dad. It would take a lot for him to break up with her."
Rob shocked his family back in January (16) when he went public with his new relationship, as Chyna is the mother of his half-sister Kylie Jenner's on/off boyfriend Tyga's son King Cairo. The couple became engaged in April after a whirlwind romance, and stunned loved ones again by revealing Blac was pregnant a month later.
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