Sorry you are not feeling well. I too had bad fainting during pregnancy but that was due to low bp and low iron. Perhaps your iron is low too - this would explain some fatigue and faint feeling. I would go and get it checked out, at the least it will make you feel more at ease. The alternative is to call someone like health direct - the 24hr nurse help line that will tell you if you should see a doctor.

Hope your feeling on top of the world and all the best for the rest of your pregnancy.