Has this prophecy of the prophet (PBUH) found in Sunni Hadith been fulfilled?

When it was daytime, the Prophet sallallaahu 'alayhi wa sallam called Fatimah and told her something in a secret voice that made her cry. Then he whispered to her something else which made her laugh. ‘Aishah enquired from her after the Prophet’s death, as to this weeping and laughing to which Fatimah replied: "The first time he disclosed to me that he would not recover from his illness and I wept. Then he told me that I would be the first of his family to join him, so I laughed." [Sahîh al-Bukhârî, 2/638]