count the order on weekly basis

I want the count of orders of a particular table on weekly basis i.e if date given to me is 10\03\2014 then my output should be count of orders from date 10\03\2014 to 09\03\2014(one week) then count of orders from 2\03\2014 to 08\03\2014(another week) and then from 24\02\2014 to 01\03\2014(another week).....