Hi there, Welcome to HCM, Anti-C antibodies found in pregnancy need to be monitored. You will need to get a blood test done to know the level of antibodies. The usual cut off considered is 20 mIU. If they are more than this it could adversely affect the baby. Anti-C though rarely found should be checked in all pregnant women as the presence of these antibodies can cause problems like ascitis, and fluid colloction in baby and in womb called polyhydramniuos. These anitbodies are more commonly seen in women who have had blood transfusion before. Once detected the levels have to be checked routinely during pregnancy and if increasing, a fetal medicine expert needs to be seen immediately. Get the titres checked and discuss the above with your obstetrician. Hope this helps. Regards.