Abu Sa’id Al Khudri traced to Prophet ﷺ the following statement regarding the captives taken at Atwas. There must be no intercourse with pregnant woman till she gives birth to her child or with the one who is not pregnant till she has had one menstrual period. (Using translation from Abū Dāʾūd 2157)  

أَنَّهُ قَالَ فِي سَبَايَا أَوْطَاسٍ «لَا تُوطَأُ حَامِلٌ حَتَّى تَضَعَ حَمْلَهَا وَلَا غَيْرُ ذَاتِ حَمْلٍ حَتَّى تَحِيضَ حَيْضَةً»  

[Machine] The Messenger of Allah ﷺ said, "A pregnant woman should not be made to carry anything until she gives birth, and a non-pregnant woman should not resume having intercourse until she menstruates."  

رَسُولُ اللهِ ﷺ لَا تُوطَأُ حَامِلٌ حَتَّى تَضَعَ حَمْلَهَا وَلَا غَيْرُ حَامِلٍ حَتَّى تَحِيضَ حَيْضَةً  

" لاَ تُوْطَأ حَامِلٌ حَتَّى تَضَعَ، وَلاَ غَيْرُ ذَاتِ حَمْلٍ حَتَّى تَحِيضَ حَيْضَةً".