Meeks- you could have low sugar levels making you dizzy which happens from time to time but sometimes flashing lights in your vision can be related to high blood pressure especially when pregnant. I had PIH (pregnancy induced hypertension) with both of the boys. Usually the flashing lights don't happen until the third trimester but its something to think about when you see you dr next. Just to bring it to their attention. Don't want to scare you but high blood pressure in pregnancy is not something to blow off. So just pay attention to it and see if it happens daily and note it to your doctor. Otherwise it could have just been a fluke and nothing more. Being preggo as you know is always making crazy things happen that we always want an answer for. I know I always do. Feel better!