Which chapters of the Qur'an should I recite for pregnancy?

There is no specific surah or particular verses to be recited for pregnancy. However, seeking forgiveness (Istighfar) is one of the means to be blessed with children, as Allah, the Most High, says: "And said, 'Ask forgiveness of your Lord. Indeed, He is ever Forgiving. He will send [rain from] the sky upon you in [abundance], And give you increase in wealth and sons, and make for you gardens and make for you rivers.'"