Cardi B went from glowing to growling after leaving court on Tuesday after someone dared to ask if she was pregnant!!!

TMZ caught the wild exchange earlier today … someone off camera asked if she would predict any paternity drama with Stefon Diggs — in light of Offset apparently bragging he banged her up with Baby No. 4!!! 😬

Cardi didn’t take kindly to the question coming from a guy outside the Alhambra, CA courthouse, and threw a pen in a fit of rage … causing her bodyguard to call her back.

Earlier today, Cardi dodged the pregnancy question as she made her way into the courtroom … but still hasn’t flat-out addressed the situation since the speculation started.