Any girls have had a period every 21 days? Normal?

Anonymous
So since July my periods have came every 21 days. To me at least it's about steady however sometimes it feels like I have a period twice a month because say I start the 26 of Aug and it goes through Sept 1st. My next period started today the 21st. Even though we are in Sept it's like if it's for October. Is this normal? I've read periods can go from 21 days to day 35, but am I worrying over nothing?
Any girls have had a period every 21 days? Normal?
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