Masruq and Amr bin Utbah (may Allah have mercy on them both) wrote to Sayyidah Subay'ah bint al-Harith al-Aslamiyyah (may Allah be pleased with her), asking her about her case. She wrote back to them that she had given birth twenty-five (days) after the death of her husband, and then prepared herself to seek good (that is, marriage). Abu al-Sanabil bin Ba'kak passed by her and said: You have hurried; observe the waiting period ('iddah) of the later of the two terms, that is, four months and ten days. (Subay'ah (may Allah be pleased with her) said:) So I came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, ask forgiveness for me. He said: "What is that about?" I told him the whole story, and he said: "If you find a righteous husband, then marry."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21115