Abnormal NIPT

Br

So I got the results of my NIPT for baby #3 a few weeks ago which said Girl, but I recently got a letter in the mail stating the results were abnormal and to schedule a visit and now I'm scared.

I don't know what to do or how to feel. I never thought this would ever be an issue so I'm scared of what I'm going to be told when I go back.

Any words of advice?