Thanks for the query.
As you are again having IgG
and IgM positive there is possibility of reinfection or reactivation of previous infection.
So better to take treatment for the infection.
Regarding the details of treatment you can read by article: http://srsree.blogspot.in/2013/02/torch-group-of-infections-toxoplasmosis
When the immunity in the body decreases the possibility of reinfection is there.
You better plan pregnancy
after complete suppression of infection.
Usually once the infection clears-off that may not have any affect on future pregnancies, but if the latent infection remains sometimes it can reactivate.