What Does A Period Look Like Why Does The Blood From My Period Look So Different This Time?

Why does the blood from my period look so different this time? - what does a period look like

My period came yesterday, but it was soo thin and light and very little .. and today there are more like the size, if you have a circle with your thumb and forefinger making, with a fine hand .. but .. Blood is too thin Think it's time .. Mine usually takes 7-10 days. It is not so. Only usually heavier. I am 13 years old and I've been 9 months.