Women should not get pregnant immediately before surgery or until at least 18 months after surgery.
During the period of rapid weight loss, certain nutritional deficiencies may occur which would put the developing baby at risk for malnutrition and birth defects. Plus, female fertility increases as weight is lost — so your chances of becoming pregnant increase in the months right after surgery.
Therefore, women of childbearing age who are having weight loss surgery should use two methods of birth control before surgery — and continue for 18 months after surgery.
After that time, when weight loss and nutritional status have stabilized, there is no restriction on pregnancy.