Weird blood pressure

Leena

35.5 weeks pregnant, whenever I get up and walk around the house such as getting a drink for my daughter and changing her diaper, my blood pressure jumps up over 140/90 and I feel super winded and heavy. As soon as I sit or lay down though it goes back to a more normal number. Ive called the doctor and they’ll be seeing me tomorrow but I was wondering if anyone else ever experienced something like this???