I just had my 20 week ultrasound and the doc said everything looked great. He indicated he was a little concerned about an indentation in baby's spine, which he said could be artifact from the ultrasound, the baby's position or indeed an indentation in the vertebrae of my baby. He did say that it was not spina befida, but I am a nervous wreck. He wants to have another ultrasound next month to look at it again. Anyone ever have this happen? I am freaking out.