Hadith 8:185
Narrated Abu Sa'id (RA)" The Prophet (ﷺ) said in regard to the captives taken at Autas, "There must be no intercourse with a pregnant woman till she gives birth, or with one who is not pregnant till she has had one menstrual period." [Abu Dawud reported it, and al-Hakim graded it Sahih (authentic)].
وَعَنْ أَبِي سَعِيدٍ - رضى الله عنه - أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -قَالَ فِي سَبَايَا أَوْطَاسٍ: { لَا تُوطَأُ حَامِلٌ حَتَّى تَضَعَ, وَلَا غَيْرُ ذَاتِ حَمْلٍ حَتَّى تَحِيضَ حَيْضَةً } أَخْرَجَهُ أَبُو دَاوُدَ, وَصَحَّحَهُ اَلْحَاكِمُ