I wouldn't worry about the pink spotting--i've had the same my last two pregnancies and now this current one as well. (but not with my son...Hmmm, makes me suspicious that this one is a girl like my last two)
it could just be your body thinking it's time for a period, or sometimes this early in the game it's just the fetus and accompanying tissue burrowing in a little deeper, displacing a tiny bit of blood. I know with my second pregnancy, when I first had spotting like that, it freaked me all out and I got my midwife to schedule me an ultrasound, but all was fine. When it happened last pregnancy, I didn't worry about it as much, and that baby was fine too. Now i'm barely thinking about it.
If you'll check some baby books, I think you'll find that the lightheadedness is a normal pregnancy symptom. You should talk to your doctor about it though because actually blacking out is a concern. You could be low in something, like iron.