I am scared of having a seizure in toxemia, what are the chances?

0.6-3%. An eclamptic seizure occurs in 2 to 3% of severely preeclamptic women not receiving anti-seizure prophylaxis with magnesium sulfate; the seizure rate is estimated to be <0.6%in women with mild preeclampsia. The incidence of eclampsia has been relatively stable at 1.6 to 10 cases per 10, 000 deliveries in developed countries.