Thank you for your query.
Firstly, Ig G antibodies
to rubella and cytomegalovirus
only indicate a past infection, and the Ig M antibody is negative, clearly indicating that there is no active infection.
So please do not worry for that right now.
There are various other causes of a missed abortion
which should be ruled out, and it should ideally be done before planning the next pregnancy.
Firstly, adequate folic acid
supplementation in the pre and peri conceptional period is essential.
Commonest cause of missed abortion is due to genetic causes, so a chromosomal analysis of the fetus is necessary.
Infections, uterine anomalies, hormonal imbalance, inadequate progesterone
secretion, autoimmune causes etc are other common causes.
Please ask your obstetrician to rule out these conditions by appropriate testing.
Have regular antenatal care.