But according to an insider, the pair hasn’t split – they've just hit a rough patch while filming their reality show.
"They filmed over the weekend and had an argument," the source tells WHO. "Rob tends to blow up and react very fast. ... They have rushed their relationship so much."
"They are both very excited about the baby," continues the source, so "it's hard to see Rob and Chyna actually splitting. Rob is looking forward to becoming a dad. It would take a lot for him to break up with her."
The pair became engaged on April 4, after only a few months of dating. In May, they announced that they were expecting their first baby together, and news broke one month later that the parents-to-be had landed their own reality show.