increase nuchal transluscency indicate following conditions-
1-down's syndrome(most common)
3- Turner syndrome
5- Trisomy 13
but chances of downs increase with increase in maternal age.but your age is only 27.so there are chances that your baby may not be down's.
The only way to know for certain if your baby has Down's or another chromosomal abnormality is to have a diagnostic test, such as CVS or amniocentesis
Sometimes, a screening test can suggest that a normal baby has a high risk of having Down's syndrome. This is called a false positive.
Combining an NT scan with a blood test
gives a more accurate result.the blood test are free beta-hCG
and a the protein PAPP-A.Babies with Down's syndrome tend to have high levels of hCG and low levels of PAPP-A. these 3 tests called combined test.
so consult your doctor about these tests and get confirmed. take care