Lightheaded and Headaches

It's not quite time for me to take my pregnancy test, but for 2 days I have woke up with an annoying headache and I've noticed during the day if I get up, I become very lightheaded/dizzy and have to just stand there for a minute feeling like I may pass out. I'm making sure not to stand up too fast or walk as soon as I stand so that's not it. Could this be mine sign? Maybe I'm pregnant?