Thank you for your health query.
Ig G only indicates a past infection with toxoplasma and not an active infection.
For that you have to measure Ig M.
is definitely one reason for a missed abortion
( fetus not having heartbeat ), but you need to evaluate yourself for other causes as well.
Most common is genetic causes.
You should send the aborted tissue for chromosomal analysis.
Also, other causes like infections, uterine abnormalities, hormonal
imbalances, autoimmune causes should be ruled out.
Please undergo a detailed evaluation before planning your next pregnancy