Yes, it is possible that Castor oil might help with pregnancy. But I would strongly advise her not to take that medication. She is already having a complex pregnancy because of her blood pressure. Use of this medicament could possibly bring more harm to her and the baby. I think we should leave the matters in the hands of the doctor who led her pregnancy.
I will say that senna is a very effective laxative but will not affect your weight much. It is important for you to try with some other way to regulate your weight. This would include a healthy diet and physical activity. With exercises, you would speed up intestines movement which would decrease the possibility of constipation occurring.
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