FAINTING

Has anyone else been fainting since testing positive for pregnancy? I just fainted in Walmart and would feel a tad better to know if I'm not the only one... I don't know what happen I just felt dizzy, my vision went blurry. Next thing I know I'm on the floor with a sore neck, back and pain in my knees. I've had a lot of health issues recently so I'm not sure if it's from that or from pregnancy.