Im sure this post is too late for you, But I had my son 4-15-09 by classical c-section. My husband and I both are Recessive polycystic kidney disease carriers. 1 in 4 chances. My son Dakota had the disease and had no amniotic fluid. We delivered 32 weeks. He was the youngest baby to ever have his kidneys removed and put on Dialysis. He did pass away @ 31/2 months ( a week b4 we were suppose to bring him home) because of medical staff neglegence and the spread of another patient germs. When I spoke with the Specialist at the Hospital (top 3rd hospital in the Nation), they said we needed to wait a year before we tried again because we increase the chance of a uterus erruption. An amnio can be done as early as 15-17 weeks of pregnancy, and a CVS (which is a tissue sample of the cord can be done between the 12-13 week. If you are that concerned, wait the time frame and start eating healthy, take prenatals and excersising NOW! Towards the end of your pregnancy you will prob be put on bed rest and have ultrasounds done once a week to see the fetal growth and to make sure you are not stretched passed your point.