Is there a way to keep blood pressure normal during pregnancy? I have proteinurua. Anything I can do to prevent preeclampsia?

Speak with OB. This is a very important topic. You can not take ace inhibitors or arb drugs (which reduce protenuria and decrease bp) during pregnancy. You may have to see a high risk pregnancy OB physician for a consult.
Yes. Blood pressure medications are frequently used. They will not have an impact on pre eclampsia risk but blood pressure control may prevent other problems in pregnancy, mostly if the bottom number is over 100. Also, the protein urea can be quantified. It sounds like you have pre existing hypertension with proeinuria, high risk for pre eclampsia. Make ur follow ups.