False/Positive Genetic Results

Shyla
After having a clear 20 week u/s my results for spinal bifida came back positive. The doctor stressed "Don't worry" as he indicated a 1/120 risk. I can't help not worrying!!! I have another u/s to follow up in one week. Has anyone else experienced this and had a healthy baby? Might this be what people refer to as a false/positive result?