High blood pressure?

So I’m 32w3d and experiencing what I believe to be waves of high blood pressure. It’s usually after I’ve had my 8oz cup of coffee or when I’m cleaning or walking in a store. What happens is I get light headed and almost dizzy like, I feel my heart start pounding and it becomes harder to breathe. Once I sit down, my feet start to swell but my heart stops pounding and I can breathe better. Eventually, my feet stop swelling and I go back to normal. I’m wondering if this is cause for immediate concern or if I can wait to bring it up to my OB on Thursday at my appointment. Has anyone had a similar experience? I’m having a little cramping but nothing too extreme, no contractions or even Braxton Hicks.