Hi welcome to Health care magic forum. Some times it happens as ovulation bleeding , or intermitent bleeding. If the bleeding is there also don't stop the tablets but continue the same strip. Then ony start the new strip.
Reducing the dose may not have any relation with the bleeding. Other causes of bleeding are intrinsic harmonal imbalance, anaemia
, (lack of blood) etc.
I advise you some diet recommendations as take more of green leafy vegetables , pulses to provide iron necessory for improvement of bllood.
Don't worry about such minor things, you will be fine. Thanks for calling.