Hi Rathna Palani!
welcome to Healthcaremagic.com.IgG antibodies
indicate previous exposure to these infections and indicate immunity. IgM antibodies are more concerning in pregnancy
because they indicates a recent infection. I want to emphasise that if IgG for Rubella
was positive you will not get rubella and need not wait to conceive anymore.
Read more at: http://doctor.ndtv.com/faq/ndtv/fid/4143/Can_I_conceive_after_a_rubella_infection_and_vaccination