The Prophet married Maimuna during the ʿUmrat-al-Qada' (i.e. the ʿUmra performed in lieu of the ʿUmra which the Prophet ﷺ could not perform because the pagans, prevented him to perform that ʿUmra).
تَزَوَّجَ النَّبِيُّ ﷺ مَيْمُونَةَ فِي عُمْرَةِ الْقَضَاءِ