You should continue the pregnancy.
Rubella IgG - test done to know the immunity status of human body against the rubella infection.
If it come positive that mean your body have immunity to protect the rubella infection
And if it come negative then you have not immunity against the rubella.
Next Steps
Don't do any thing without doctor advise.
Health Tips
Please follow good life style .
Do routine vaccination of pregnancy with advise of doctor.
Take iron and folic acid for 6 month in the pregnancy.
Keep positive attitude to fight any disease and any problem of your life.