It is narrated from Sayyiduna al-Miswar bin Makhramah (may Allah be pleased with him) that the husband of Subay'ah bint al-Harith (may Allah be pleased with her) died, and she gave birth eight - or seven - (days later), and the Messenger of Allah (peace and blessings be upon him) commanded her to marry.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17142