My period disappeared?

Okay, so my period started a day early this month, so this should be my second day but it's my third, I took a bath last night because I can, put a tampon in because I had no pads left, and thought that was that. I should add that I had mostly passed brown blood for the past day.
After 7 hours of having a tampon in, nothing happened. I usually bleed through in like 5 hours, and nothing was on the liner I was using. I removed the tampon and put a pad on right after, to see it was barely bloodied at all! So I went to bed, and woke up this morning, went to the bathroom. My pad from last night is completely empty! I haven't lost a drop of blood since then, and most of my periods are atleast 4-6 days long. I almost never have spotting, either. What could be wrong?

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