High NT thickness

Hi! My nipt test results is low risk but the NT scan is 7.6mm. Doc said there could be risk of chromosomal, genetic or structural heart disorder. Referred me to another doctor for amniocentesis. I'm 42 yo and ftm. Any one faced similar situation before? Most of the posts I have seen are rather borderline NT score. Mine is like 3x the normal range. Feeling so distressed.