In your case because of previous bad obstetrics history- you must carry the pregnancy this time. Chance of repeat high BP is there again and you will need careful follow up through out for that as well as risk of early labour. The Susten in the low dose is safe as now child is already 7 months and can be slowly weaned of breast milk / reduced. Safety precautions for the pregnancy include avoiding weights, stress, sex, and very heavy work. Regular meals, light exercise and adequate sleep are essential enough - 1 litre /day milk intake with plenty of fresh fruits and vegetables and proteins – 15 gm/ day is necessary.