Dizzyness

I only found out yesterday that I was pregnant and going by my last period I would only be 4 weeks but over the last week and half I've been having dizzy spells. Getting worse and so much today that I have to keep sitting down, if i stand up for longer that even a minute i have to sit back down. Everything is still spinning when I'm sat down but far worse when I'm standing. Has anyone had this and this early as its seems strange to me. I am waiting for a call from doctor tomorrow as I've had a previous ectopic but I just dont know if this is normal? Thanks