Unusually Long Period

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Unusually Long Period
I am a 24 yr old female that up until this recently has had very regular cycles. A few months ago, I only spotted for a for a couple of days and then became regular again. But this month is very unusual. My periods normally only last 3-4 days at the most. However, this month I am sitting at 14 days and still bleeding. For the first few days, it was just like a normal period (which aren't really heavy anyway) and had to use tampons. But after about day 4 it became light enough that I haven't had to use a tampon since. I am concerned about it because this is not normal for me. What could be the cause of this and what do I need to do?
Answer:

Unusually Long Period
I forgot to mention that I have also recently stopped taking my birth control pills. I have been off of them for just over a month now. Could this have something to do with it?
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