You have to apply COUNT to the same query that provides the correct results. Does Access not have a count function that you can merely pass the result to? Something like
result = SELECT DISTINCT [SV-5.NameA]
FROM ([SV-5] LEFT JOIN SFtoFD ON [SV-5].NAMEA = SFtoFD.NAMEB) LEFT JOIN SFtoSV4 ON [SV-5].NAMEA = SFtoSV4.NAMEB
WHERE SFtoSV4.NAMEB IS NULL AND SFtoFD.NAMEB IS NULL;
records = num_rows (result)
I don't have Access on this system, so I can't check for you. Look at your docs.