Given that you have proteinuria at the beginning of pregnancy, we can assume that you have proteinuria when you are not pregnant. You have some sort of renal disease that needs careful attention when you are pregnant and when you are not pregnant. Do you know your creatine level or creatinine clearance, (a measure of your renal function)? There are a multitude of diseases that could cause proteinuria such as diabetes, lupus or IgA nephropathy. A few of them respond to treatment with steroids. Some nephrologists will recommend a kidney biopsy to determine the cause. This information occasionally can direct therapy. It can also help know what clinical course the disease will run. Some diseases are worse than others.
Outside pregnancy, blood pressure is treated very aggressively in the case of renal disease, (<130/80). In pregnancy, treatment is much more controversial. At 100/64, you do not need treatment. At 120/80, I would certainly begin to be concerned.
Renal disease is certainly a risk factor for preeclampsia. You have had preeclampsia before - that is also a risk.. You will very probably have preeclampsia again. It only really matters when you get it - hopefully near term, and that you are followed carefully. Your blood pressure and the baby's growth are the most critical things to be concerned about.
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