Help??

Ok so today is when my period is supposed to start and normally it starts pretty heavy but I went to the bathroom in the middle of the day and when I wiped, it was a light pink with a couple spots of red so I put in a tampon & when I went to pee later, there was just a tiny pink spot on it so I just put another one in and I just took it out and there's no blood at all. Any idea why that was happening? (This has never happened to me before.)

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