Some things that you might want to think about giving up, if you haven't already are:
caffeine- Increases the risk of miscarriage.
Alcohol- Is linked to miscarriage, stillbirths and low birth weight.
Smoking- Growth retardation and low birth weight.
Drugs- Can cause severe damage to a fetus.
Before starting a family it is a good idea to visit the doctor for a health check up. It is advisable to look into your family history for medical and health issues that could possibly effect you and your future family.