He might be a nine pounder! I say the bigger the better! Just imagine those chubby cheeks you will get to smooch all over! Worst case senerio, they might posibly induce you if they are afraid you won't be able to deliver vaginally!
he could be nine/ten pounds possibly, then again the growth may slow down a bit, doc told me that they can have growth spurts, so he may not be as big as you fear. The main thing is you obviously have a healthy little boy who loves his food!! I would ask the doctor about this on monday, he may be able to tell you a rough estimate for his final weight!!