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Why is it short?

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Ok my period is usually a week long and a few days ago I got what I thought was my period but it was only two days... Me and my boyfriend are trying to have a bby, we have been having unprotectd sex for the past 3 months and well my periods keep on coming but their only 2 or 3 days long, so why is it short?? I've done pregnancy tests and they all come out negative.. Does sex affect my menstrual cycle?? It has never affectd me but why now??