How to find total row count on weekly basis

I have written a join query which works perfect and it give me total number of rows between two dates, however is there a way where i can modify my query so that i can see the result on weekly basis from January 2014 to may 2014
;WITH SourceData
as
    SELECT tablet.Approach.ApproachId
    ,StartDateTime
    ,QuestionId, Stage
    FROM Tablet.Approach
    JOIN tablet.DataCapture ON tablet.Approach.ApproachId = tablet.DataCapture.ApproachId
    WHERE QuestionId in (9,10)
    and Stage = 2
    and StartDateTime between '2014-01-01 00:00:00' and '2014-05-20 00:00:00'
,RecordCnt
AS
    SELECT COUNT(ApproachId) AS TotalInformationEffectContacts
    FROM SourceData
Select * from SourceData Cross join RecordCnt
order by StartDateTime asc

Use GROUP BY datediff(ww,@startdate,@enddate)
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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