Folic acid? How much should I be taking?

My prenatals only have 800mcg and was wondering if I should take a bit more? I have an extra bottle of folic acid SO was taking when we were ttc that is 400mcg. I don't see my dr until the 27th, I'll be 7weeks and 5days then. Would that be too much too take? or no? I'm not sure of the recommended amount.