HI Belinda,
I am really sorry you have had such a stressful ultrasound.
This is a marker, that doesn't mean it is. In the absence of other markers in my experience it would be unlikely.
Have you had a talk with your ob?
It is really upsetting that you have just been left with this 'possbility' with no further direction. I urge you to phone and ask to speak further about this. Again, in the absence of any other indicators I believe your babies risk would be low.
I am sorry to not be of more help. Sending you lots of love... :hugs: