Some wonderful advice here (as always). The only thing I would like to chime in with, is this. When pregnant, it is so important to stay calm and as stress free as possible, from personal experience the state of mind/health/stress levels of a pregnant woman can really affect the growing baby, not perhaps physically, but certainly on some kind of emotional level.
Don't let some (possibly inaccurate) test affect your daughter during one of the most rewarding and exciting times of her life. Relax and enjoy....