This is what worked for me. I went to 42w5 days with no problems using this list

# Fish Oil supplement that is tested safe for heavy metal content
# High protein diet of 75 to 100 grams daily, more if you already have pre-eclampsia
# Plenty of water
# Eat salt as taste requires
# Calcium and Magnesium supplements (in the form of tablets or pregnancy herbal infusions & teas)
# Moderate exercise
# Avoid toxic substances that tax the liver and kidneys (caffeine, pollution from smokers or high traffic, strong chemicals and scents in the home, refined foods such as white sugar/flour/salt, processed foods, and take NO drugs at all.)
# Full body water immersion is also supposed to help lower blood pressure
# Foods for lowering blood pressure include garlic, cucumbers, parsley and onions.
# Drink a cup of skullcap tea/infusion as needed
# Drink red raspberry leaf, dandelion and nettle tea regularly
# Balance your sodium and potassium levels in the body with raw beet juice (also increases calcium)