How The Cm Like Three Days Before Period What's Going On With My Period?

What's going on with my period? - how the cm like three days before period

My time is usually 7 days long with a relatively moderate speed. Monday evening, before bedtime, I noticed inch red, and took my time, sometimes starting in the night. He did, however, was very clear. Here we have three days into my "time" and I'm almost over, I hardly bleeding. What could be causing this? This is very unusual for me.