Sahih Muslim 5618
صحيح مسلم#5618SahihAsma', daughter of Abu Bakr, reported that when she migrated to Allah's Messenger (ﷺ) in Medina she was in the family way with Abdullah b. Zubair in her womb
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 38:33