Execute the following against your database and substitute the table name in the WHERE predicate and post the results back please
SELECTOBJECT_NAME(i.object_id) AS TableName
, ISNULL(i.name, 'HEAP') AS IndexName
, i.type_desc AS IndexType
, p.partition_number AS PartitionNo
, p.rows AS NumRows
, au.type_desc AS InType
, au.total_pages AS NumPages
, au.total_pages * 8 AS TotKBs
, au.used_pages * 8 AS UsedKBs
, au.data_pages * 8 AS DataKBs
FROM sys.indexes i INNER JOIN sys.partitions p
ON i.object_id = p.object_id AND i.index_id = p.index_id
INNER JOIN sys.allocation_units au ON
CASE
WHEN au.type IN (1,3) THEN p.hobt_id
WHEN au.type = 2 THEN p.partition_id
END = au.container_id
WHERE OBJECT_NAME(i.object_id) = 'yourtablename'
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