Bleeding??

Annalyse
According to glow, my period is supposed to start February 14th. My fertile window supposedly closed today. Yesterday and the day before, I was spotting very lightly brown blood, and today, the blood was bright red with a lot more.. I thought maybe it was because I've had sex the last three days. Should I be worried? Is my period coming early? I'm irregular so if that was the case then it's no big deal. 

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