Hi skyinvan,
if you haven't informed CIC about your new residential address yet you will have to do so immediately,you can inform them online via Ecas,you can also email the CPP-ottawa.if you have done so already then there is nothing to worry about.
since you have been living in the US for 8 months and your application is in process,most likely you will be asked to provide FBI clearance,this will usually come along with medical request or RPRF or both.
good luck.