Pregnant women have to be tested for toxoplasm. If they have developped antibodies they had the infection in the past and unless the mother have other health issues or immune system problems, all should be ok (follow the advice of your doctor). If not and still negative, she should take some safety measures and carefully check for low-grade fever and other symptoms of acute infection during pregnancy; the infection can be and must be treated; as soon as possible. For the pregnancy period and until the first year of life of the baby.
It is estimated among 500 and 5000 cases of newborns having congenital Toxoplasmosis in USA each year (Boyer et al. 2005, American journal of Obstetrics and Gynecology 192). The prognosis is good if treated early.
In Turkey it is prevalent. Pregnant women who tested negative are discouraged from eating raw fruits or vegetables unless they know that the food was properly sanitized. Catching it during pregnancy might cause disfigurement of fetus.