Thanks for the query.
As rubella can lead to congenital anomalies in early gestational age
and as you are having high IgG levels, better to go for estimation of IgM antibodies
and IgG avidity.
If these levels are also raised better option is termination pregnancy. After that you can go for rubella vaccination
If not you can go for ultrasound
, if baby is normal you can continue the pregnancy with regular antenatal checkups and ultrasound examinations. But it should be kept in mind that all anomalies may not be identified by ultrasound.
For more details:http://srsree.blogspot.in/2013/02/torch-group-of-infections-rubella.html