Missing inward credit

my office is in  one place , my factory is in  another place, some time   purchase's bill   going direct factory , so  I  some of  bills missed august month's. invoice . now i see  gstr 2A  that's bill showing .every month  we paid  gst  tax as per 3b .Now should I reflect such purchases in gstr-3b of februray or should wait for gstr 3 of August to be filled.