In a dream it signifies unbelief, because of His saying, the Exalted:
إِنَّكَ إِن تَذَرْهُمْ يُضِلُّوا۟ عِبَادَكَ وَلَا يَلِدُوٓا۟ إِلَّا فَاجِرًا كَفَّارًا
“Indeed, if You leave them, they will mislead Your servants and not beget except [every] wicked one and [confirmed] disbeliever.”
Quran 71:27 · Saheeh International
The wickedness (fujur) of a pregnant woman is her delivery, and her wickedness is the child [wordplay: fajara also means to burst forth].