Toxoplasmosis is not a serious disease unless you were not immune before you became pregnant. To avoid getting toxoplasmosis during your pregnancy, the first rule of thumb is to wash all your fruits and vegetables thoroughly with vinegar.
You should also stop eating raw or undercooked animal products, such as raw milk cheeses, steak tartares, deli meats or cold cuts, unpasteurized milk, and raw eggs in egg creams and mayonnaise (no eggnog for you this year, sorry!).
One last piece of advice: if you have a cat and are not immune to toxoplasmosis, have someone else change the litter box during your pregnancy.