30 Weeks Pregnant and Super Lightheaded?

I woke up and felt sorta off. Like my head just felt full and heavy. I went to brush my teeth and had to brace myself because my vision went blurry. I sat down and closed my eyes. I’m not sure if I passed out or not. I finally started to feel better and got up and was fine. Is this one time occurrence something I should call my obgyn about or should I just let it go?