Fainting ?

Ladies have any of you fainted due to pregnancy ? I fainted Thursday afternoon , I was out shopping with my two kids , after hibernating for weeks cause I had zero energy . The whole store stated spinning as I was paying the cashier , when I walked out and the air from outside hot ken, I went down pretty bad and grabbed onto a teen boy walking in as I was walking out . I kinda grabbed me , startled by what had happened, he was kind walked me to my car which I forgot where I even parked . He brought me some cold water . It was so so scary . I always thought pregnancy fainting was a novela/ movie thing . This is my third pregnancy and that had never happened to me . Never in my life have I almost fainted or fainted all the way . Talk about scary . I skinned my knee pretty bad