Hi,
Thanks for the query.
Scanty flow during periods is called
hypomenorrhea.
This can occur due to many causes like hormonal imbalance due to poly cystic ovary disease, stress and strain, weight changes etc.
General causes like anemia, diabetes, thyroid hormonal abnormalities,
prolactin hormonal abnormalities etc.
For more details : http://srsree.blogspot.com/2013/11/hypomenorrhea-part-1.html
So, once consult gynecologist and get evaluated.
By examination and by investigations like blood
hemoglobin levels, blood sugar levels, thyroid profile, prolactin levels and
ultrasound, the possible cause for your problem can be identified.
Depending on the cause treatment can be planned.
Take care.