serologic diagnosis of primary CMV infection during pregnancy
is documented by eitherseroconversion (the appearance of CMV-specific IgG antibody in a previously seronegative woman) or detection of specific IgM antibody associated with low IgG avidity.
if u have detectable specific IgG antibodies
without IgM antibodies before pregnancy and a significant rise of IgG antibody titre with or without the presence of specific IgMantibodies and with high IgG avidity can be classified as having recurrent infection.but you may not have previous records of the test.
if it is primary infection then there is 30 to 40 percent chance of intrauterine transmission to fetus with with delivery of 10% to 15% symptomatic newborns and late neurologic sequelae in 10% of those asymptomatic at birth.chance is bit higher if it is in 1st trimester.
so your next step is to diagnose fetal infection
. Ultrasonographic findings are helpful but not diagnostic.CMV isolation from amniotic fluid
has been recognized as the gold standard for prenatal diagnosis
of fetal CMV infection
.so you can consult your doctor for amniocentesis
after 21st week.
hope this is helpful to you. take care