late period but not pregnant

Katie
Me and my boyfriend haven't had sex in about a month ( we always have it protected and it anything slips of breaks, I take a plan b). A couple weeks ago I took a pregnancy test- just better to be safe than sorry, and it was negative. We've kinda fooled around but haven't had sex. My period is only a week late, but it's very VERY irregular. Anyone know maybe why?

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