If i had heart defect at birth, do i see my pediatric doctor before trying to get pregnant?

No: You need to see your ob/gyn when you get pregnant and tell him about this. There are ways of diagnosing abnormalities in pregnancy really early.

Cardiologist: You should probably get a cardiology consult just to make sure that there is no remaining functional deficit. Then your fetus should get a pediatric cardiologist to do an echo during pregnancy, as some defects are hereditary.

See a cardiologist: If you still have a relationship with the pediatric cardiologist who cared for you, check with them first. Otherwise you need to get an expert opinion. It depends a lot upon what heart defect you had, some are obviously more important long term than others.