Implantation or af

Drea
So I'm on the pill, we don't use condoms, I don't take it at the same time everyday.  it seems to work for me because  I've been on it for around 6 months. My fiancée and I would be elated if I was pregnant btw, we would just like to be married beforehand.  Anyhoo my period came really early this month, around two weeks before my period was even due. But it only lasted three days when it usually lasts 6. Any insights as to why that is?

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