This is my third pregnancy and I've had fainting spells with my previous two nor while not pregnant. However, recently, I started to blacked out and sat myself quickly to the floor so i wouldn't hit hard and slowly began to recover. I didn't completely faint but did lose control and was sweaty on my neck even in air conditioning during the episode. It was a different feeling from being light headed or dizzy(i have experienced those but not this pregnancy) and scared me to death.