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Greetings of the day
Its quite normal for the periods to have light flow especially if on birth control pills.
There seems to be no cause of concern.
Even if you insists of getting a pregnancy
test done, there is no harm. Negative test will be very much reassuring to you.
In case you need any further assistance, will be glad to assist you.
Wishing you happy and healthy life
Dr Deepak K K