Hello,
It is possible that not taking the placebos is causing the light periods. The placebos are meant to give your body time to lower the hormonal levels enough to cause periods. It is only when the hormonal level has decreased to a certain level that proper periods can occur. Your not taking the placebos has caused the hormonal levels to remain high all the time, preventing proper blood flow during the periods.
This is also not safe for you and can cause hormonal imbalances later on.
If the urine pregnancy test is negative, please take a blood pregnancy test. If that too is negative, then you are unlikely to be pregnant. In that case, please stop taking birth control pills completely for at least 6 months and allow your body to come back to normal. This will prevent hormonal imbalances in future. Take another contraceptive like condoms during this period. You can restart birth control pills after 6 months.
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology