Pregnant and I feel like I'm going to faint: what does this mean
It could be dehydration.
Not enough to eat.
You could have stood up too fast.
If you are in your second or third trimester you could have been lying on your back, which is a no-no as it cuts off your blood circulation to your womb.
You may be overheated.
It is always good to mention this to your doctor, just in case.