What are some signs of preeclampsia beside high blood pressure and protein in your urine? And how do you tell if you do have high blood pressure?

Past week I have been feeling really dizzy and nausea. I wake up feeling dizzy. I do have a bad headache that hasn't gone away but I cant tell if its just a normal headache that i have. (I do have past with headaches not going away) I do plan on talking to my doctor at my next appointment.