Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
What can someone who has not been able to conceive recite?
Our Shaykh, Habib ‘Attas al-Habashi, used to recommend reciting Surat al-Fatihah 41 times between the Sunnah and Fard of Fajr with the intention of being blessed with a child.
Also recite the following verses 100 times a day or more or less:
رَبِّ هَبْ لِي مِن لَّدُنْكَ ذُرِّيَّةً طَيِّبَةً إِنَّكَ سَمِيعُ الدُّعَاء
Rabbi hab li milladunka dhurriyyatan tayyibatan innaka sami`u-du`a’
“O my Lord! Grant me from You pure descendants, for You hear all prayers!” (Al `Imran, 3:38)
رَبِّ لا تَذَرْني فَرْداً و أَنْتَ خَيْرُ الوارِثينَ
Rabbi la tadharni fardan wa anta khayrul-warithin
“O my Lord! Leave me not without offspring, and You are the best of inheritors.” (Al-Anbiya’, 21:89)
رَبَّنَا هَبْ لَنَا مِنْ أَزْوَاجِنَا وَذُرِّيَّاتِنَا قُرَّةَ أَعْيُنٍ وَاجْعَلْنَا لِلْمُتَّقِينَ إِمَامًا
Rabbana hab lana min azwajina wa dhurriyyatina qurrata `ayun wa’ja’lna lilmuttaqina imama
“Our Lord! Grant unto us wives and offspring who will be the comfort of our eyes, and give us (the grace) to lead the righteous.” (Al-Furqan, 25:74)