Don't drink, don't smoke and take lots of folic acid - this is very important and you should start taking it before you try for a baby or as soon as you suspect you are pregnant. it is completely harmless, found in green vegetables, and you can get it from the chemist, google it and find all the evidence for taking.
Drink red raspberry tea to improve and maintain the health of the reproductive system during pregnancy.
Avoid alcohol, caffeine, cigarette smoke, drugs, and sugar during pregnancy.
Alfalfa, dandelion, and kelp are a good source of iron and iodine.
Take extra vitamin E during pregancy to heal reproductive organs.