IUGR advice??.. 33w pregnant & told baby is growing way too small..

Today I had an appointment with my OB and she scheduled an ultrasound for today to continue monitoring my baby's growth.. 2 weeks ago, he was growing fairly normally, in the 45th percentile... Now he's in the 10th... He weighs 4 pounds even currently, and my OB is scheduling us with a high risk doctor for their advice and opinion... Any advice?? Or has anyone else been told the same??😓