Is It Possible To Have Your Period And Still Be

Is it possible to have your period and still be pregnant? I didnt have a period last month and then my cycle came in early november im still on but i have high blood pressure and the only time i have issues with my blood pressure has been while i have been pregnant plus i have alot of the other pregnancy symptoms. I have 3 children and i can tell the difference between my pregnancy symptoms and my pms or menstral symptoms. I have a home pregnancy test and im afraid to take it because i dont know if the blood from my cycle will cause it to be a false negative.