The general guideline for waiting is 18 months after surgery. Successful pregnancies, however, have been carried in women who were as little as 5 to 6 weeks post gastric bypass
Is it Okay to Lose Weight During Pregnancy?
There are many gastric bypass patients who continue to lose weight through the entire pregnancy and have healthy babies. This is especially true of patients who have become pregnant before the 18 month time frame has lapsed. Weight loss
was once thought to have a negative effect on the fetus, but studies have shown otherwise. The obese
woman is losing extra weight. As long as the nutritional values stay within a healthy level, there is no reason why the body would stop losing weight during the pregnancy. As the end of the pregnancy approaches, the weight loss should slow as baby is gaining as much as mom is losing.
So you should not worry and keep your regular date with the obstetrician.