Hello! Welcome and thank you for asking on HCM! Regarding your concern, I would explain that it is quite normal to have low blood pressure during pregnancy. Nevertheless, I would not recommend additional drugs besides diet modifications to help increase blood pressure. I would only recommend avoid standing up position and staying in hot places. Increasing salt intake and some additional coffee can be helpful. She can try to use an antiacid if she has stomach fullness or heartburn. From the other hand, I would recommend performing monthly complete blood count for possible anemia, blood electrolytes, kidney and liver function tests, and fasting glucose in order to exclude possible metabolic disorder which could aggravate her symptoms. Hope you will find this answer helpful! Kind regards, Dr. Iliri