I hate to be the bearer of bad news but according to what little studies have been done on the subject having previously had preclampsia is one of the highest risk factors for having the condition again. Seems exact rates vary somewhere between 5-80% depending on specifics of the previous pregnancy.

On a more positive note there are measures that can be taken to reduce your risk some of which are as simple as dietary changes. I'd recommend talking to the doctor who handled your first pregnancy since he/she would be familiar with your case and health and can advise you as to how at risk you are and how to reduce that risk.

Recurrence of preeclampsia is influenced by several factors like certainty and severity of the disorder in the affected pregnancy, the presence of underlying illness, genetic tendencies, and change of partners.

Those who are young healthy women with severe preeclampsia or eclampsia in the first pregnancy were found to have a 19.5% risk for developing mild preeclampsia, a 25.9% risk for severe preeclampsia and a 1.4% risk for eclampsia in the subsequent pregnancy.

Women with preeclampsia-eclamspisa that occured in the late second or early third trimester are particularly at risk. Women who has preeclampsia may be at an increased risk for chronic hypertension later in life and can possibly be diagnosed with renal disease. While those women who have had severe preeclampsia at less than 34 weeks gestation should be tested for antiphospholipid syndrome and possibly for inherited thrombophilias.

Recent invsetigations in preeclampsia have centered on prevention. Giving low-dose aspirin for 50-150 mg, oral calcium supplementation, garlic tablet, fish oils and magnesium supplementation have been found to be ineffective in preventing preeclampsia. The search for prevention continues, however initial studies of antioxidants such as vitamins C and E are quite promising.