Thanks for the query.
Menstrual cycle duration ranging between 1 to 7 days is considered as normal. So you need not worry for the same.
Duration of menstrual cycle depends on the thickness of endometrium.
also known as short or scanty periods, is extremely light menstrual blood flow.
Diagnosis is by Blood Tests,Ultra sonogram.
Other tests: Tests such as dilation and curettage
scans are sometimes needed to determine the cause of scanty blood flow during the periods.
Treatment: Unless a significant causal abnormality is found no treatment other than reassurance is necessary. Otherwise, treatment is determined by the diagnosis of any significant causal abnormality.
hope this helps.