Missed birth control pill?

Roughly 16/17 days ago I missed 3 birth control pills in a row. Since this I have been bleeding for 13 days consecutively. I have taken a pregnancy test which was negative also, just as a precaution. I have started a new pack of pills a few days ago and i still seem to be having this long “period”. Does anyone have any recommendations on what I should do?

Missed birth control pill?
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