NF thickness 7mm at 20 weeks

My wife (29 years) had her 3rd ultrasound at 20th week, and the doctor said everything looks ok except the nuchal fold thickness is at 7mm, and anything above 6mm is considered abnormal. The NT measurements on first and second ultrasounds were reported as normal. Only in the third ultrasound we came to know about this first time. This is her second pregnancy. Our first kid (2.6 years old) had no issues. The second baby is also a boy. None of our family members has a history of DS or other genetical disorders as far as we know (until 3 generations back).

We are stressed a lot since last week and will continue to be, until this Friday to meet genetic counsellor and know what is gonna happen next. I heard triple marker test can only be done before 22 weeks. Now that my wife is in her 23rd week, what tests can she safely take ?

Any good news from other parents who had similar abnormal readings?