35 weeks and baby measuring small, was normal size 4 weeks ago - IUGR?

My doctor said that because I had an abnormal quad screen bt the baby appeared healthy that the problem could lie in the placenta. He told me that when I hit 30 weeks that they will check the babys growth and the placenta and every 2 weeks after that. The placenta may be aging faster than the baby. Just try to relax while you can cause soon you'll have a healthy baby