Could I have preeclampsia?

Hey ladies so I’m 38 weeks pregnant and I’ve been feeling a little off the past few weeks. I’ve noticed that I’m starting to get headaches, dizzy spells and have been feeling extremely nauseous. I’ve thrown up twice from the dizzy spells and have almost passed out once while walking about with my husband. The only question I have is every time I go into my OB for my weekly check up my blood pressure is perfectly fine? For those who have been diagnosed with it what can you tell me about my symptoms and when should I be more straight forward with my doctor about mine and the babies needs.