Thanks for the query.
Sometimes there could be scanty flow during the periods, which is called as hypomenorrhea
It can occur due to many causes like hormonal
imbalance, anemia, thyroid disorders etc.
So you once consult gynecologist, get examined and go for ultrasound
If she suggest you go for hormonal profile including thyroid hormones, prolactin
By this the possible cause can be identified and treated.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429