"She would have preferred to have announced it on Mother's Day herself," a rep for the model tells PEOPLE, "but her hand was forced."
Chyna, who's officially launching her emojis on Tuesday, had wanted to announce the pregnancy in her own time, "But allegedly the other half of her family leaked her story so she had to announce it," says the rep, speaking of the Kardashians.
"The only people that knew from Chyna's side was myself and Amber," he says of her best friend Amber Rose. "Her mother didn't even know. [Chyna's] moment was taken from her, which is really sad."
When it comes to why her future in-laws may have jumped the gun, the rep says "It's the business. There's a TV show to promote."
Still, the new mom, is in good spirits. "She's very happy and doing great. She hasn't had morning sickness. It's been a very easy pregnancy thus far."
As for her Mother's Day plans now, "She's already a mother," says the rep of her 3-year-old son with ex and Kylie Jenner's boyfriend Tyga. "She's going to do something with her son."