Al-Miswar b. Makhrama said that some nights after her husband’s death Subai’a al-Aslamiya gave birth to a child. Then she went to the Prophet (ﷺ) and asked permission to marry. He gave her permission and she married. Bukhari transmitted it.

وَعَنِ الْمِسْوَرِ بْنِ مَخْرَمَةَ: أَنَّ سُبَيْعَةَ الْأَسْلَمِيَّةَ نُفِسَتْ بَعْدَ وَفَاةِ زَوْجِهَا بِلَيَالٍ فَجَاءَتِ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَاسْتَأْذَنَتْهُ أَنْ تَنْكِحَ فأذِنَ لَهَا فنكحت. رَوَاهُ البُخَارِيّ