Head rush feeling with Braxton hicks?

I'm 25+4 and I've noticed this week that when I have a Braxton hick I will first notice I'll all of a sudden I'll get this head rush feeling (feels like when you hang upside down and the blood flow rushes to your head feeling). I'll feel this literally a few seconds before feeling the Braxton hick coming on that's how I have been able to notice them. Kinda makes me feel dizzy just a couple of seconds while its happening. If I remember, this also happened with my last pregnancy but don't remember if I asked my OB about it or not. Anyone else get this head rush feeling during Braxton hicks?