Thanks for the query.
If you used the pills as per the schedule the possibility of the pregnancy
The scanty flow can be due to usage of pills or due to the stress
and strain altering the hormonal
If you are still having doubt, go for pregnancy test once.
If the test comes negative, no need to worry.
And you can continue the pill as usual.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429