The best remedy for constipation during pregnancy is the herb sat isabgol (psyllium husks). Take 1 teaspoon with a glass of warm milk.
A cup of hot milk with 1 teaspoon of ghee added is also effective. Ghee and milk mixed together is a wonderful combination for gentle, mild laxative action during pregnancy.
One of the most effective herbal remedies for constipation, triphala, should not be used during pregnancy. It will irritate the child, and the baby will become hyperactive.
Also, do not take castor oil or any other drastic purgative during pregnancy; like triphala, it will make the baby hyperactive.
Similarly Aloe vera should not be used during prenancy. It will also make the baby hyperactive in the uterus.