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tablet is a hormone tablet containing progesterone
which is an important hormone to maintain pregnancy
.So your doctor had prescribed it as you have pcod
in which there are disturbance in levels of that hormone. Now the after effects of this tablet is that it causes withdrawal bleeding or menses after you stop it.so you got your periods after stopping it .It is an expected effect and not harmful.you can discuss It with your treating doctor if the bleeding is prolonged, otherwise you neednot worry.